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Saturday, December 13, 2025

Artificial intelligence arms race

From Wikipedia, the free encyclopedia

A military artificial intelligence arms race is an economic and military competition between two or more states to develop and deploy advanced AI technologies and lethal autonomous weapons systems (LAWS). The goal is to gain a strategic or tactical advantage over rivals, similar to previous arms races involving nuclear or conventional military technologies. Since the mid-2010s, many analysts have noted the emergence of such an arms race between superpowers for better AI technology and military AI,[1][2] driven by increasing geopolitical and military tensions.

An AI arms race is sometimes placed in the context of an AI Cold War between the United States and China. Several influential figures and publications have emphasized that whoever develops artificial general intelligence (AGI) first could dominate global affairs in the 21st century. Russian President Vladimir Putin stated that the leader in AI will "rule the world." Experts and analysts—from researchers like Leopold Aschenbrenner to institutions like Lawfare and Foreign Policy—warn that the AGI race between major powers like the U.S. and China could reshape geopolitical power. This includes AI for surveillance, autonomous weapons, decision-making systems, cyber operations, and more.

Terminology

Lethal autonomous weapons systems use artificial intelligence to identify and kill human targets without human intervention. LAWS have colloquially been called "slaughterbots" or "killer robots". Broadly, any competition for superior AI is sometimes framed as an "arms race". Advantages in military AI overlap with advantages in other sectors, as countries pursue both economic and military advantages, as per previous arms races throughout history.

History

Nationality of AAAI presenters (%)
Country 2012 2017
United States 41 34
China 10 23
United Kingdom 5 13

In 2014, AI specialist Steve Omohundro warned that "An autonomous weapons arms race is already taking place". According to Siemens, worldwide military spending on robotics was US$5.1 billion in 2010 and US$7.5 billion in 2015.

China became a top player in artificial intelligence research in the 2010s. According to the Financial Times, in 2016, for the first time, China published more AI research papers than the entire European Union. When restricted to number of AI papers in the top 5% of cited papers, China overtook the United States in 2016 but lagged behind the European Union. 23% of the researchers presenting at the 2017 American Association for the Advancement of Artificial Intelligence (AAAI) conference were Chinese. Eric Schmidt, the former chairman and chief executive officer of Alphabet, has predicted China will be the leading country in AI by 2025.

Risks

One risk concerns the AI race itself, whether or not the race is won by any one group. There are strong incentives for development teams to cut corners with regard to the safety of the system, increasing the risk of critical failures and unintended consequences. This is in part due to the perceived advantage of being the first to develop advanced AI technology. One team appearing to be on the brink of a breakthrough can encourage other teams to take shortcuts, ignore precautions and deploy a system that is less ready. Some argue that using "race" terminology at all in this context can exacerbate this effect.

Another potential danger of an AI arms race is the possibility of losing control of the AI systems; the risk is compounded in the case of a race to artificial general intelligence, which may present an existential risk. In 2023, a United States Air Force official reportedly said that during a computer test, a simulated AI drone killed the human character operating it. The USAF later said the official had misspoken and that it never conducted such simulations.

A third risk of an AI arms race is whether or not the race is actually won by one group. The concern is regarding the consolidation of power and technological advantage in the hands of one group. A US government report argued that "AI-enabled capabilities could be used to threaten critical infrastructure, amplify disinformation campaigns, and wage war", and that "global stability and nuclear deterrence could be undermined".

By nation

United States

In 2014, former Secretary of Defense Chuck Hagel posited the "Third Offset Strategy" that rapid advances in artificial intelligence will define the next generation of warfare. According to data science and analytics firm Govini, the U.S. Department of Defense (DoD) increased investment in artificial intelligence, big data and cloud computing from $5.6 billion in 2011 to $7.4 billion in 2016. However, the civilian NSF budget for AI saw no increase in 2017. Japan Times reported in 2018 that the United States private investment is around $70 billion per year. The November 2019 'Interim Report' of the United States' National Security Commission on Artificial Intelligence confirmed that AI is critical to US technological military superiority.

The U.S. has many military AI combat programs, such as the Sea Hunter autonomous warship, which is designed to operate for extended periods at sea without a single crew member, and to even guide itself in and out of port. From 2017, a temporary US Department of Defense directive requires a human operator to be kept in the loop when it comes to the taking of human life by autonomous weapons systems. On October 31, 2019, the United States Department of Defense's Defense Innovation Board published the draft of a report recommending principles for the ethical use of artificial intelligence by the Department of Defense that would ensure a human operator would always be able to look into the 'black box' and understand the kill-chain process. However, a major concern is how the report will be implemented.

The Joint Artificial Intelligence Center (JAIC) (pronounced "jake") is an American organization on exploring the usage of AI (particularly edge computing), Network of Networks, and AI-enhanced communication, for use in actual combat. It is a subdivision of the United States Armed Forces and was created in June 2018. The organization's stated objective is to "transform the US Department of Defense by accelerating the delivery and adoption of AI to achieve mission impact at scale. The goal is to use AI to solve large and complex problem sets that span multiple combat systems; then, ensure the combat Systems and Components have real-time access to ever-improving libraries of data sets and tools."

In 2023, Microsoft pitched the DoD to use DALL-E models to train its battlefield management systemOpenAI, the developer of DALL-E, removed the blanket ban on military and warfare use from its usage policies in January 2024. The Biden administration imposed restrictions on the export of advanced NVIDIA chips and GPUs to China in an effort to limit China's progress in artificial intelligence and high-performance computing. The policy aimed to prevent the use of cutting-edge U.S. technology in military or surveillance applications and to maintain a strategic advantage in the global AI race.

In 2025, under the second Trump administration, the United States began a broad deregulation campaign aimed at accelerating growth in sectors critical to artificial intelligence, including nuclear energy, infrastructure, and high-performance computing. The goal was to remove regulatory barriers and attract private investment to boost domestic AI capabilities. This included easing restrictions on data usage, speeding up approvals for AI-related infrastructure projects, and incentivizing innovation in cloud computing and semiconductors. Companies like NVIDIA, Oracle, and Cisco played a central role in these efforts, expanding their AI research, data center capacity, and partnerships to help position the U.S. as a global leader in AI development.

Project Maven

Project Maven is a Pentagon project involving using machine learning and engineering talent to distinguish people and objects in drone videos, apparently giving the government real-time battlefield command and control, and the ability to track, tag and spy on targets without human involvement. Initially the effort was led by Robert O. Work who was concerned about China's military use of the emerging technology. Reportedly, Pentagon development stops short of acting as an AI weapons system capable of firing on self-designated targets. The project was established in a memo by the U.S. Deputy Secretary of Defense on 26 April 2017. Also known as the Algorithmic Warfare Cross Functional Team, it is, according to Lt. Gen. of the United States Air Force Jack Shanahan in November 2017, a project "designed to be that pilot project, that pathfinder, that spark that kindles the flame front of artificial intelligence across the rest of the [Defense] Department". Its chief, U.S. Marine Corps Col. Drew Cukor, said: "People and computers will work symbiotically to increase the ability of weapon systems to detect objects." Project Maven has been noted by allies, such as Australia's Ian Langford, for the ability to identify adversaries by harvesting data from sensors on UAVs and satellite. At the second Defense One Tech Summit in July 2017, Cukor also said that the investment in a "deliberate workflow process" was funded by the Department [of Defense] through its "rapid acquisition authorities" for about "the next 36 months".

Project Artemis

The U.S. Department of Defense is partnering with Ukraine on "Project Artemis" to develop advanced drones that can withstand electronic warfare, blending Ukrainian simplicity and adaptability with American precision. Due to the Russia-Ukraine war, Ukraine has emerged as a leader in drone production and warfare, creating cost-effective systems that challenge traditional approaches. Countries like Turkey, China, and Iran are also producing affordable drones, reducing America's monopoly and reshaping warfare dynamics. U.S. efforts are focused on integrating AI, drone swarm technology, and hybrid drone systems to maintain military dominance. The democratization of drone technology raises issues, such as autonomous decision-making, counter-drone defenses, and dual-use concerns, that challenge ethical and security norms.

Stargate Project

The Stargate Project is a joint venture announced in 2025 by OpenAI CEO Sam Altman, U.S. President Donald Trump, Oracle Corporation, MGX, SoftBank Group, and other partners. The initiative aims to develop large-scale artificial intelligence (AI) infrastructure in the United States, with a projected $500 billion investment by 2029. The project focuses on building advanced data centers, custom AI hardware, and sustainable energy systems, while also supporting research, workforce development, and national AI competitiveness. It is considered an effort to position the U.S. as a global leader in AI technology. The program has been compared to the Manhattan Project because of its large scale.

China

China is pursuing a strategic policy of military-civil fusion on AI for global technological supremacy. According to a February 2019 report by Gregory C. Allen of the Center for a New American Security, China's leadership – including General Secretary of the Chinese Communist Party Xi Jinping – believes that being at the forefront in AI technology is critical to the future of global military and economic power competition. Chinese military officials have said that their goal is to incorporate commercial AI technology to "narrow the gap between the Chinese military and global advanced powers." The close ties between Silicon Valley and China, and the open nature of the American research community, has made the West's most advanced AI technology easily available to China; in addition, Chinese industry has numerous home-grown AI accomplishments of its own, such as Baidu passing a notable Chinese-language speech recognition capability benchmark in 2015. As of 2017, Beijing's roadmap aims to create a $150 billion AI industry by 2030. Before 2013, Chinese defense procurement was mainly restricted to a few conglomerates; however, as of 2017, China often sources sensitive emerging technology such as drones and artificial intelligence from private start-up companies. An October 2021 report by the Center for Security and Emerging Technology found that "Most of the [Chinese military]'s AI equipment suppliers are not state-owned defense enterprises, but private Chinese tech companies founded after 2010." The report estimated that Chinese military spending on AI exceeded $1.6 billion each year. The Japan Times reported in 2018 that annual private Chinese investment in AI is under $7 billion per year. AI startups in China received nearly half of total global investment in AI startups in 2017; the Chinese filed for nearly five times as many AI patents as did Americans.

China published a position paper in 2016 questioning the adequacy of existing international law to address the eventuality of fully autonomous weapons, becoming the first permanent member of the U. N. Security Council to broach the issue. In 2018, CCP general secretary Xi Jinping called for greater international cooperation in basic AI research. Chinese officials have expressed concern that AI such as drones could lead to accidental war, especially in the absence of international norms. In 2019, former United States Secretary of Defense Mark Esper lashed out at China for selling drones capable of taking life with no human oversight.

The focus on "intelligentized AI warfare", pursued by China, suggests a comprehensive integration of AI across all domains (land, sea, air, space, and cyber) for autonomous attack, defence and cognitive warfare. The intelligentized strategy is distinct from traditional warfare, which focuses on network-centric operations, and instead sees AI as a force multiplier that enhances decision-making, command structures, and autonomous capabilities. Unlike traditional warfare, intelligentization leverages AI to create a cognitive advantage—allowing it to process battlefield information better. AI-assisted command-and-control (C2) systems, predictive analytics, and real-time data fusion, enabling accelerated human-AI hybrid decision-making. Autonomous systems, including drone swarms, AI-powered cyber warfare, play a crucial role in this strategy. China is reported to be currently developing wingman drones, robotic ground forces, and optimised logistics to enhance combat effectiveness. The Chinese army (PLA)) also emphasises cognitive warfare using AI-driven psychological operations, social media manipulation, and predictive behavioural analysis to influence adversaries and the importance of dynamic responses where AI enhances hacking capabilities, automated SIGINT (Signals Intelligence) and adaptive tactics. However, despite this focus, some analysts believe China could be struggling to fully realise AI capability within the military environment: a "comprehensive review of dozens of Chinese-language journal articles about AI and warfare reveals that Chinese defense experts claim that Beijing is facing several technological challenges that may hinder its ability to capitalize on the advantages provided by military AI"

India

A task force for the Strategic Implementation of AI for National Security and Defence was established in February 2018 by the Ministry of Defense's Department of Defence Production. The process of getting the military ready for AI use was started by the MoD in 2019. The Centre for Artificial Intelligence and Robotics was approved to develop AI solutions to improve intelligence collection and analysis capabilities. In 2021, the Indian Army, with assistance from the National Security Council, began operating the Quantum Lab and Artificial Intelligence Center at the Military College of Telecommunication Engineering. With an emphasis on robotics and artificial intelligence, Defence Research and Development Organisation and Indian Institute of Science established the Joint Advanced Technology Programme-Center of Excellence. In 2022, the Indian Navy created an AI Core group and set up a Center of Excellence for AI and Big Data analysis at INS Valsura. Indian Army incubated Artificial Intelligence Offensive Drone Operations Project. During Exercise Dakshin Shakti 2021, the Indian Army integrated AI into its intelligence, surveillance, and reconnaissance architecture.

In 2022, the Indian government established the Defence Artificial Intelligence Council and the Defence AI Project Agency, and it also published a list of 75 defense-related AI priority projects. MoD earmarked 1,000 crore annually till 2026 for capacity building, infrastructure setup, data preparation, and Al project implementation. The Indian Army, the Indian Navy and the Indian Air Force set aside ₹100 crore annually for the development of AI-specific applications. The military is already deploying some AI-enabled projects and equipment. At Air Force Station Rajokri, the IAF Centre of Excellence for Artificial Intelligence was established in 2022 as part of the Unit for Digitization, Automation, Artificial Intelligence, and Application Networking (UDAAN). Swarm drone systems were introduced by the Mechanised Infantry Regiment for offensive operations close to the Line of Actual Control.

For offensive operations, the military began acquiring AI-enabled UAVs and swarm drones. Bharat Electronics developed AI-enabled audio transcription and analysis software for battlefield communication. Using AI during transport operations, the Indian Army's Research & Development branch patented driver tiredness monitoring system. As part of initial investment, the Indian Armed Forces is investing about $50 million (€47.2 million) yearly on AI, according to Delhi Policy Group. For high altitude logistics at forward outposts, military robots are deployed. Army is developing autonomous combat vehicles, robotic surveillance platforms, and Manned-Unmanned Teaming (MUM-T) solutions as part of the Defence AI roadmap. MCTE is working with the Ministry of Electronics and Information Technology and, Society for Applied Microwave Electronics Engineering & Research, on AI and military-grade chipset. Phase III of AI-enabled space-based surveillance has been authorized.

DRDO Chairman and Secretary of the Department of Defense Research & Development Samir V. Kamat said the agency started concentrating on the potential use of AI in the development of military systems and subsystems. The Indian government intends to leverage the private sector's sizable AI workforce and dual-use technologies for defense by 2026. In order to conduct research on autonomous platforms, improved surveillance, predictive maintenance, and intelligent decision support system, the Indian Army AI Incubation Center was established. Indian Navy launched INS Surat with AI capabilities.

Iran

In 2025 Iranian regime established National AI action with ($20bn USD) 100.000.000.000.000.000 billion Rial investment backed by National Development Fund of Iran incorporated National Artificial Intelligence Organization.IRGC commander General Pakpur ordered bombs using Ai to be developed while Ai has reportedly already been deployed for Afghan border control. Before the Israel-Iran war the army had advertised AI ready weapons,Iran and Russia have signed a new cooperation agreement on artificial intelligence. IRGC Navy has also tested AI missiles capable.

Russia

A cartoon centipede reads books and types on a laptop.
Putin (seated, center) at National Knowledge Day, 2017

Russian General Viktor Bondarev, commander-in-chief of the Russian air force, stated that as early as February 2017, Russia was working on AI-guided missiles that could decide to switch targets mid-flight. The Military-Industrial Commission of Russia has approved plans to derive 30 percent of Russia's combat power from remote controlled and AI-enabled robotic platforms by 2030. Reports by state-sponsored Russian media on potential military uses of AI increased in mid-2017. In May 2017, the CEO of Russia's Kronstadt Group, a defense contractor, stated that "there already exist completely autonomous AI operation systems that provide the means for UAV clusters, when they fulfill missions autonomously, sharing tasks between them, and interact", and that it is inevitable that "swarms of drones" will one day fly over combat zones. Russia has been testing several autonomous and semi-autonomous combat systems, such as Kalashnikov's "neural net" combat module, with a machine gun, a camera, and an AI that its makers claim can make its own targeting judgements without human intervention.

In September 2017, during a National Knowledge Day address to over a million students in 16,000 Russian schools, Russian President Vladimir Putin stated "Artificial intelligence is the future, not only for Russia but for all humankind... Whoever becomes the leader in this sphere will become the ruler of the world". Putin also said it would be better to prevent any single actor achieving a monopoly, but that if Russia became the leader in AI, they would share their "technology with the rest of the world, like we are doing now with atomic and nuclear technology".

Russia is establishing a number of organizations devoted to the development of military AI. In March 2018, the Russian government released a 10-point AI agenda, which calls for the establishment of an AI and Big Data consortium, a Fund for Analytical Algorithms and Programs, a state-backed AI training and education program, a dedicated AI lab, and a National Center for Artificial Intelligence, among other initiatives. In addition, Russia recently created a defense research organization, roughly equivalent to DARPA, dedicated to autonomy and robotics called the Foundation for Advanced Studies, and initiated an annual conference on "Robotization of the Armed Forces of the Russian Federation."

The Russian military has been researching a number of AI applications, with a heavy emphasis on semiautonomous and autonomous vehicles. In an official statement on November 1, 2017, Viktor Bondarev, chairman of the Federation Council's Defense and Security Committee, stated that "artificial intelligence will be able to replace a soldier on the battlefield and a pilot in an aircraft cockpit" and later noted that "the day is nearing when vehicles will get artificial intelligence." Bondarev made these remarks in close proximity to the successful test of Nerehta, an crewless Russian ground vehicle that reportedly "outperformed existing [crewed] combat vehicles." Russia plans to use Nerehta as a research and development platform for AI and may one day deploy the system in combat, intelligence gathering, or logistics roles. Russia has also reportedly built a combat module for crewless ground vehicles that is capable of autonomous target identification—and, potentially, target engagement—and plans to develop a suite of AI-enabled autonomous systems.

In addition, the Russian military plans to incorporate AI into crewless aerial, naval, and undersea vehicles and is currently developing swarming capabilities. It is also exploring innovative uses of AI for remote sensing and electronic warfare, including adaptive frequency hopping, waveforms, and countermeasures. Russia has also made extensive use of AI technologies for domestic propaganda and surveillance, as well as for information operations directed against the United States and U.S. allies.

The Russian government has strongly rejected any ban on lethal autonomous weapon systems, suggesting that such an international ban could be ignored.

The Russian invasion of Ukraine and the ensuing Russia-Ukraine war has seen seen significant use of AI by both sides and has also been characterised as a drone war. Advances in AI-powered GPS-denied navigation and drone swarming techniques are significantly improving operational capabilities for Ukraine. Fully realised drone swarms, where multiple drones coordinate and make decisions autonomously, are still in the early stages of experimentation but Ukraine is exploring and implementing these techniques in a real conflict situation. The Defense Intelligence of Ukraine (DIU) has been at the forefront of utilizing drones with some elements of autonomy for conducting long-range strikes into Russian territory. Domestic drone production has significantly expanded, with approximately 2 million drones produced in 2024, 96.2% of which were domestically manufactured.

Rather than replacing human involvement, AI is primarily serving to augment existing capabilities, enhancing the speed, accuracy, and overall efficiency of numerous military functions.

Perhaps the most important way in which AI has been used by Ukraine is in intelligence, surveillance, and reconnaissance (ISR) capabilities. The Ukrainian military uses Palantir's MetaConstellation software to monitor the movement of Russian troops and supplies (highlighting the blurring of boundaries between state military and commercial AI use). It aggregates data from various commercial civilian providers of satellite imagery Ukraine also uses its own Delta system which aggregates real time data from drone imagery, satellite photos, acoustic signals, and text to construct an operational picture for military commanders. AI is used to prioritise incoming threats, potential targets and resource constraints.

AI is also being used to process intercepted communications from Russian soldiers, to process, select, and output militarily useful information from these intercepted calls.

Israel

Israel has made extensive use of AI for military applications specially during the Gaza war. The main AI systems used for target identification are the Gospel and Lavender. Lavender developed by the Unit 8200 identifies and creates a database of individuals mostly low-ranking militants of Hamas and the Palestinian Islamic Jihad and has a 90% accuracy rate and a database of tens of thousands. The Gospel in comparisons recommended buildings and structures rather than individuals. The acceptable collateral damage and the type of weapon used to eliminate the target is decided by IDF members and could track militants even when at home.

Israel's Harpy anti-radar "fire and forget" drone is designed to be launched by ground troops, and autonomously fly over an area to find and destroy radar that fits pre-determined criteria. The application of artificial intelligence is also expected to be advanced in crewless ground systems and robotic vehicles such as the Guardium MK III and later versions. These robotic vehicles are used in border defense.

United Kingdom

In 2015, the UK government opposed a ban on lethal autonomous weapons, stating that "international humanitarian law already provides sufficient regulation for this area", but that all weapons employed by UK armed forces would be "under human oversight and control".

South Korea

The South Korean Super aEgis II machine gun, unveiled in 2010, sees use both in South Korea and in the Middle East. It can identify, track, and destroy a moving target at a range of 4 km. While the technology can theoretically operate without human intervention, in practice safeguards are installed to require manual input. A South Korean manufacturer states, "Our weapons don't sleep, like humans must. They can see in the dark, like humans can't. Our technology therefore plugs the gaps in human capability", and they want to "get to a place where our software can discern whether a target is friend, foe, civilian or military".

Saudi Arabia

Saudi Arabia entered the AI race relatively late, beginning in the early 2020s. The country announced its Vision 2030 initiative—a multi-trillion dollar plan to diversify its oil-dependent economy—under the leadership of the Public Investment Fund (PIF). A key turning point in U.S.-Saudi relations came during President Donald Trump's first foreign trip in 2017, when he visited Riyadh and signed hundreds of billions of dollars in agreements spanning defense, energy, and technology. This visit laid the groundwork for deeper U.S.-Saudi cooperation in areas like AI and tech infrastructure. In the years that followed, Saudi Arabia formed major partnerships with U.S. firms like NVIDIA, AMD, and Cisco, investing billions in semiconductors, cloud computing, and AI research. Saudi-backed startup Humain also partnered with several American firms, further strengthening the Kingdom's ties with Silicon Valley as it pushed to become a global leader in artificial intelligence by 2030.

United Arab Emirates

The United Arab Emirates has been expanding its role in artificial intelligence and technology through investments in infrastructure and partnerships. One major initiative is MGX, a UAE-backed technology group focused on AI development. In 2025, U.S. President Donald Trump visited the UAE, where he met with Emirati officials and business leaders. The visit included discussions on technology and economic cooperation, including potential collaborations with U.S. companies such as Oracle, NVIDIA, and Cisco.[138] These talks focused on areas like data centers, AI hardware, and advanced computing, reflecting ongoing efforts by the UAE to strengthen its technological capabilities through international partnerships. NVIDIA, OpenAI, and Cisco have announced plans to collaborate on building one of the world's largest data centers in the United Arab Emirates. The project is part of the UAE's broader strategy to become a global technology and AI hub. The data center will support advanced cloud computing, AI model training, and data storage capabilities.

European Union

The European Parliament holds the position that humans must have oversight and decision-making power over lethal autonomous weapons. However, it is up to each member state of the European Union to determine their stance on the use of autonomous weapons and the mixed stances of the member states is perhaps the greatest hindrance to the European Union's ability to develop autonomous weapons. Some members such as France, Germany, Italy, and Sweden are developing lethal autonomous weapons. Some members remain undecided about the use of autonomous military weapons and Austria has even called to ban the use of such weapons.

Some EU member states have developed and are developing automated weapons. Germany has developed an active protection system, the Active Defense System, that can respond to a threat with complete autonomy in less than a millisecond. Italy plans to incorporate autonomous weapons systems into its future military plans.

Proposals for international regulation

The international regulation of autonomous weapons is an emerging issue for international law. AI arms control will likely require the institutionalization of new international norms embodied in effective technical specifications combined with active monitoring and informal diplomacy by communities of experts, together with a legal and political verification process. As early as 2007, scholars such as AI professor Noel Sharkey have warned of "an emerging arms race among the hi-tech nations to develop autonomous submarines, fighter jets, battleships and tanks that can find their own targets and apply violent force without the involvement of meaningful human decisions".

Miles Brundage of the University of Oxford has argued an AI arms race might be somewhat mitigated through diplomacy: "We saw in the various historical arms races that collaboration and dialog can pay dividends". Over a hundred experts signed an open letter in 2017 calling on the UN to address the issue of lethal autonomous weapons; however, at a November 2017 session of the UN Convention on Certain Conventional Weapons (CCW), diplomats could not agree even on how to define such weapons. The Indian ambassador and chair of the CCW stated that agreement on rules remained a distant prospect. As of 2019, 26 heads of state and 21 Nobel Peace Prize laureates have backed a ban on autonomous weapons. However, as of 2022, most major powers continue to oppose a ban on autonomous weapons.

Many experts believe attempts to completely ban killer robots are likely to fail, in part because detecting treaty violations would be extremely difficult. A 2017 report from Harvard's Belfer Center predicts that AI has the potential to be as transformative as nuclear weapons. The report further argues that "Preventing expanded military use of AI is likely impossible" and that "the more modest goal of safe and effective technology management must be pursued", such as banning the attaching of an AI dead man's switch to a nuclear arsenal.

Other reactions to autonomous weapons

A 2015 open letter by the Future of Life Institute calling for the prohibition of lethal autonomous weapons systems has been signed by over 26,000 citizens, including physicist Stephen Hawking, Tesla magnate Elon Musk, Apple's Steve Wozniak and Twitter co-founder Jack Dorsey, and over 4,600 artificial intelligence researchers, including Stuart Russell, Bart Selman and Francesca Rossi. The Future of Life Institute has also released two fictional films, Slaughterbots (2017) and Slaughterbots - if human: kill() (2021), which portray threats of autonomous weapons and promote a ban, both of which went viral.

Professor Noel Sharkey of the University of Sheffield argues that autonomous weapons will inevitably fall into the hands of terrorist groups such as the Islamic State.

Disassociation

Many Western tech companies avoid being associated too closely with the U.S. military, for fear of losing access to China's market. Furthermore, some researchers, such as DeepMind CEO Demis Hassabis, are ideologically opposed to contributing to military work.

For example, in June 2018, company sources at Google said that top executive Diane Greene told staff that the company would not follow-up Project Maven after the current contract expired in March 2019.

Astrobiology

From Wikipedia, the free encyclopedia
https://en.wikipedia.org/wiki/Astrobiology
Nucleic acids may not be the only biomolecules in the universe capable of coding for life processes.

Astrobiology (also xenology or exobiology) is a scientific field within the life and environmental sciences that studies the origins, early evolution, distribution, and future of life in the universe by investigating its deterministic conditions and contingent events. As a discipline, astrobiology is founded on the premise that life may exist beyond Earth.

Research in astrobiology comprises three main areas: the study of habitable environments in the Solar System and beyond, the search for planetary biosignatures of past or present extraterrestrial life, and the study of the origin and early evolution of life on Earth.

The field of astrobiology has its origins in the 20th century with the advent of space exploration and the discovery of exoplanets. Early astrobiology research focused on the search for extraterrestrial life and the study of the potential for life to exist on other planets. In the 1960s and 1970s, NASA began its astrobiology pursuits within the Viking program, which was the first US mission to land on Mars and search for signs of life. This mission, along with other early space exploration missions, laid the foundation for the development of astrobiology as a discipline.

Regarding habitable environments, astrobiology investigates potential locations beyond Earth that could support life, such as Mars, Europa, and exoplanets, through research into the extremophiles populating austere environments on Earth, like volcanic and deep sea environments. Research within this topic is conducted utilising the methodology of the geosciences, especially geobiology, for astrobiological applications.

The search for biosignatures involves the identification of signs of past or present life in the form of organic compounds, isotopic ratios, or microbial fossils. Research within this topic is conducted utilising the methodology of planetary and environmental science, especially atmospheric science, for astrobiological applications, and is often conducted through remote sensing and in situ missions.

Astrobiology also concerns the study of the origin and early evolution of life on Earth to try to understand the conditions that are necessary for life to form on other planets. This research seeks to understand how life emerged from non-living matter and how it evolved to become the diverse array of organisms we see today. Research within this topic is conducted utilising the methodology of paleosciences, especially paleobiology, for astrobiological applications.

Astrobiology is a rapidly developing field with a strong interdisciplinary aspect that holds many challenges and opportunities for scientists. Astrobiology programs and research centres are present in many universities and research institutions around the world, and space agencies like NASA and ESA have dedicated departments and programs for astrobiology research.

Overview

The term astrobiology was first proposed by the Russian astronomer Gavriil Tikhov in 1953. It is etymologically derived from the Greek ἄστρον, "star"; βίος, "life"; and -λογία, -logia, "study". A close synonym is exobiology from the Greek Έξω, "external"; βίος, "life"; and -λογία, -logia, "study", coined by American molecular biologist Joshua Lederberg; exobiology is considered to have a narrow scope limited to the search for life external to Earth. Another associated term is xenobiology, from the Greek ξένος, "foreign"; βίος, "life"; and -λογία, "study", coined by American science fiction writer Robert Heinlein in his 1954 work The Star Beast; xenobiology is now used in a more specialised sense, referring to 'biology based on foreign chemistry', whether of extraterrestrial or terrestrial (typically synthetic) origin.

While the potential for extraterrestrial life, especially intelligent life, has been explored throughout human history within philosophy and narrative, the question is a verifiable hypothesis and thus a valid line of scientific inquiry; planetary scientist David Grinspoon calls it a field of natural philosophy, grounding speculation on the unknown in known scientific theory.

The modern field of astrobiology can be traced back to the 1950s and 1960s with the advent of space exploration, when scientists began to seriously consider the possibility of life on other planets. In 1957, the Soviet Union launched Sputnik 1, the first artificial satellite, which marked the beginning of the Space Age. This event led to an increase in the study of the potential for life on other planets, as scientists began to consider the possibilities opened up by the new technology of space exploration. In 1959, NASA funded its first exobiology project, and in 1960, NASA founded the Exobiology Program, now one of four main elements of NASA's current Astrobiology Program. In 1971, NASA funded Project Cyclops, part of the search for extraterrestrial intelligence, to search radio frequencies of the electromagnetic spectrum for interstellar communications transmitted by extraterrestrial life outside the Solar System. In the 1960s-1970s, NASA established the Viking program, which was the first US mission to land on Mars and search for metabolic signs of present life; the results were inconclusive.

In the 1980s and 1990s, the field began to expand and diversify as new discoveries and technologies emerged. The discovery of microbial life in extreme environments on Earth, such as deep-sea hydrothermal vents, helped to clarify the feasibility of potential life existing in harsh conditions. The development of new techniques for the detection of biosignatures, such as the use of stable isotopes, also played a significant role in the evolution of the field.

The contemporary landscape of astrobiology emerged in the early 21st century, focused on utilising Earth and environmental science for applications within comparate space environments. Missions included the ESA's Beagle 2, which failed minutes after landing on Mars, NASA's Phoenix lander, which probed the environment for past and present planetary habitability of microbial life on Mars and researched the history of water, and NASA's Curiosity rover, currently probing the environment for past and present planetary habitability of microbial life on Mars.

Theoretical foundations

Planetary habitability

Astrobiological research makes a number of simplifying assumptions when studying the necessary components for planetary habitability.

Carbon and Organic Compounds: Carbon is the fourth most abundant element in the universe and the energy required to make or break a bond is at just the appropriate level for building molecules that are not only stable, but also reactive. The fact that carbon atoms bond readily to other carbon atoms allows for the building of extremely long and complex molecules. As such, astrobiological research presumes that the vast majority of life forms in the Milky Way galaxy are based on carbon chemistries, as are all life forms on Earth. However, theoretical astrobiology entertains the potential for other organic molecular bases for life, thus astrobiological research often focuses on identifying environments that have the potential to support life based on the presence of organic compounds.

Liquid water: Liquid water is a common molecule that provides an excellent environment for the formation of complicated carbon-based molecules, and is generally considered necessary for life as we know it to exist. Thus, astrobiological research presumes that extraterrestrial life similarly depends upon access to liquid water, and often focuses on identifying environments that have the potential to support liquid water. Some researchers posit environments of water-ammonia mixtures as possible solvents for hypothetical types of biochemistry.

Environmental stability: Where organisms adaptively evolve to the conditions of the environments in which they reside, environmental stability is considered necessary for life to exist. This presupposes the necessity of a stable temperature, pressure, and radiation levels; resultantly, astrobiological research focuses on planets orbiting Sun-like red dwarf stars. This is because very large stars have relatively short lifetimes, meaning that life might not have time to emerge on planets orbiting them; very small stars provide so little heat and warmth that only planets in very close orbits around them would not be frozen solid, and in such close orbits these planets would be tidally locked to the star; whereas the long lifetimes of red dwarfs could allow the development of habitable environments on planets with thick atmospheres. This is significant as red dwarfs are extremely common. (See also: Habitability of red dwarf systems).

Energy source: It is assumed that any life elsewhere in the universe would also require an energy source. Previously, it was assumed that this would necessarily be from a Sun-like star, however with developments within extremophile research contemporary astrobiological research often focuses on identifying environments that have the potential to support life based on the availability of an energy source, such as the presence of volcanic activity on a planet or moon that could provide a source of heat and energy.

It is important to note that these assumptions are based on our current understanding of life on Earth and the conditions under which it can exist. As our understanding of life and the potential for it to exist in different environments evolves, these assumptions may change.

Methods

Studying terrestrial extremophiles

Astrobiological research concerning the study of habitable environments in the Solar System and beyond utilises methods within the geosciences. Research within this branch primarily concerns the geobiology of organisms that can survive in extreme environments on Earth, such as in volcanic or deep sea environments, to understand the limits of life, and the conditions under which life might be able to survive on other planets. This includes, but is not limited to:

Deep-sea extremophiles: Researchers are studying organisms that live in the extreme environments of deep-sea hydrothermal vents and cold seeps. These organisms survive in the absence of sunlight, and some are able to survive in high temperatures and pressures, and use chemical energy instead of sunlight to produce food.

Desert extremophiles: Researchers are studying organisms that can survive in extreme dry, high temperature conditions, such as in deserts.

Microbes in extreme environments: Researchers are investigating the diversity and activity of microorganisms in environments such as deep mines, subsurface soil, cold glaciers and polar ice, and high-altitude environments.

Researching Earth's present environment

Research also regards the long-term survival of life on Earth, and the possibilities and hazards of life on other planets, including:

Biodiversity and ecosystem resilience: Scientists are studying how the diversity of life and the interactions between different species contribute to the resilience of ecosystems and their ability to recover from disturbances.

Climate change and extinction: Researchers are investigating the impacts of climate change on different species and ecosystems, and how they may lead to extinction or adaptation. This includes the evolution of Earth's climate and geology, and their potential impact on the habitability of the planet in the future, especially for humans.

Human impact on the biosphere: Scientists are studying the ways in which human activities, such as deforestation, pollution, and the introduction of invasive species, are affecting the biosphere and the long-term survival of life on Earth.

Long-term preservation of life: Researchers are exploring ways to preserve samples of life on Earth for long periods of time, such as cryopreservation and genomic preservation, in the event of a catastrophic event that could wipe out most of life on Earth.

Finding biosignatures on other worlds

Emerging astrobiological research concerning the search for planetary biosignatures of past or present extraterrestrial life utilise methodologies within planetary sciences. These include:

The study of microbial life in the subsurface of Mars:

Scientists are using data from Mars rover missions to study the composition of the subsurface of Mars, searching for biosignatures of past or present microbial life.

The study of liquid bodies on icy moons:

Discoveries of surface and subsurface bodies of liquid on moons such as EuropaTitan and Enceladus showed possible habitability zones, making them viable targets for the search for extraterrestrial life. As of September 2024, missions like Europa Clipper and Dragonfly are planned to search for biosignatures within these environments.

The interior of Europa

The study of the atmospheres of planets:

Scientists are studying the potential for life to exist in the atmospheres of planets, with a focus on the study of the physical and chemical conditions necessary for such life to exist, namely the detection of organic molecules and biosignature gases; for example, the study of the possibility of life in the atmospheres of exoplanets that orbit red dwarfs and the study of the potential for microbial life in the upper atmosphere of Venus.

Telescopes and remote sensing of exoplanets: The discovery of thousands of exoplanets has opened up new opportunities for the search for biosignatures. Scientists are using telescopes such as the James Webb Space Telescope and the Transiting Exoplanet Survey Satellite to search for biosignatures on exoplanets. They are also developing new techniques for the detection of biosignatures, such as the use of remote sensing to search for biosignatures in the atmosphere of exoplanets.

Talking to extraterrestrials

SETI and CETI

Scientists search for signals from intelligent extraterrestrial civilizations using radio and optical telescopes within the discipline of extraterrestrial intelligence communications (CETI). CETI focuses on composing and deciphering messages that could theoretically be understood by another technological civilization. Communication attempts by humans have included broadcasting mathematical languages, pictorial systems such as the Arecibo message, and computational approaches to detecting and deciphering 'natural' language communication. While some high-profile scientists, such as Carl Sagan, have advocated the transmission of messages, theoretical physicist Stephen Hawking warned against it, suggesting that aliens may raid Earth for its resources.

Investigating the early Earth

Emerging astrobiological research concerning the study of the origin and early evolution of life on Earth utilises methodologies within the palaeosciences. These include:

The study of the early atmosphere: Researchers are investigating the role of the early atmosphere in providing the right conditions for the emergence of life, such as the presence of gases that could have helped to stabilise the climate and the formation of organic molecules.

The study of the early magnetic field: Researchers are investigating the role of the early magnetic field in protecting the Earth from harmful radiation and helping to stabilise the climate. This research has immense astrobiological implications where the subjects of current astrobiological research like Mars lack such a field.

The study of prebiotic chemistry: Scientists are studying the chemical reactions that could have occurred on the early Earth that led to the formation of the building blocks of life- amino acids, nucleotides, and lipids- and how these molecules could have formed spontaneously under early Earth conditions.

Chart showing the theorized origin of the chemical elements that make up the human body

The study of impact events: Scientists are investigating the potential role of impact events- especially meteorites- in the delivery of water and organic molecules to early Earth.

The study of the primordial soup:

Researchers are investigating the conditions and ingredients that were present on the early Earth that could have led to the formation of the first living organisms, such as the presence of water and organic molecules, and how these ingredients could have led to the formation of the first living organisms. This includes the role of water in the formation of the first cells and in catalysing chemical reactions.

The study of the role of minerals: Scientists are investigating the role of minerals like clay in catalysing the formation of organic molecules, thus playing a role in the emergence of life on Earth.

The study of the role of energy and electricity: Scientists are investigating the potential sources of energy and electricity that could have been available on the early Earth, and their role in the formation of organic molecules, thus the emergence of life.

The study of the early oceans: Scientists are investigating the composition and chemistry of the early oceans and how it may have played a role in the emergence of life, such as the presence of dissolved minerals that could have helped to catalyse the formation of organic molecules.

The study of hydrothermal vents: Scientists are investigating the potential role of hydrothermal vents in the origin of life, as these environments may have provided the energy and chemical building blocks needed for its emergence.

The study of plate tectonics: Scientists are investigating the role of plate tectonics in creating a diverse range of environments on the early Earth.

The study of the early biosphere: Researchers are investigating the diversity and activity of microorganisms in the early Earth, and how these organisms may have played a role in the emergence of life.

The study of microbial fossils: Scientists are investigating the presence of microbial fossils in ancient rocks, which can provide clues about the early evolution of life on Earth and the emergence of the first organisms.

Research

The systematic search for possible life outside Earth is a valid multidisciplinary scientific endeavor. However, hypotheses and predictions as to its existence and origin vary widely, and at the present, the development of hypotheses firmly grounded on science may be considered astrobiology's most concrete practical application. It has been proposed that viruses are likely to be encountered on other life-bearing planets, and may be present even if there are no biological cells.

Research outcomes

As of 2024, no evidence of extraterrestrial life has been identified. Examination of the Allan Hills 84001 meteorite, which was recovered in Antarctica in 1984 and originated from Mars, is thought by David McKay, as well as few other scientists, to contain microfossils of extraterrestrial origin; this interpretation is controversial.

Asteroid(s) may have transported life to Earth.

Yamato 000593, the second largest meteorite from Mars, was found on Earth in 2000. At a microscopic level, spheres are found in the meteorite that are rich in carbon compared to surrounding areas that lack such spheres. The carbon-rich spheres may have been formed by biotic activity according to some NASA scientists.

On 5 March 2011, Richard B. Hoover, a scientist with the Marshall Space Flight Center, speculated on the finding of alleged microfossils similar to cyanobacteria in CI1 carbonaceous meteorites in the fringe Journal of Cosmology, a story widely reported on by mainstream media. However, NASA formally distanced itself from Hoover's claim. According to American astrophysicist Neil deGrasse Tyson: "At the moment, life on Earth is the only known life in the universe, but there are compelling arguments to suggest we are not alone."

Elements of astrobiology

Astronomy

Artist's impression of the extrasolar planet OGLE-2005-BLG-390Lb orbiting its star 20,000 light-years from Earth; this planet was discovered with gravitational microlensing.
The NASA Kepler mission, launched in March 2009, searches for extrasolar planets.

Most astronomy-related astrobiology research falls into the category of extrasolar planet (exoplanet) detection, the hypothesis being that if life arose on Earth, then it could also arise on other planets with similar characteristics. To that end, a number of instruments designed to detect Earth-sized exoplanets have been considered, most notably NASA's Terrestrial Planet Finder (TPF) and ESA's Darwin programs, both of which have been cancelled. NASA launched the Kepler mission in March 2009, and the French Space Agency launched the COROT space mission in 2006. There are also several less ambitious ground-based efforts underway.

The goal of these missions is not only to detect Earth-sized planets but also to directly detect light from the planet so that it may be studied spectroscopically. By examining planetary spectra, it would be possible to determine the basic composition of an extrasolar planet's atmosphere and/or surface. Given this knowledge, it may be possible to assess the likelihood of life being found on that planet. A NASA research group, the Virtual Planet Laboratory, is using computer modeling to generate a wide variety of virtual planets to see what they would look like if viewed by TPF or Darwin. It is hoped that once these missions come online, their spectra can be cross-checked with these virtual planetary spectra for features that might indicate the presence of life.

An estimate for the number of planets with intelligent communicative extraterrestrial life can be gleaned from the Drake equation, essentially an equation expressing the probability of intelligent life as the product of factors such as the fraction of planets that might be habitable and the fraction of planets on which life might arise:

where:

  • N = The number of communicative civilizations
  • R* = The rate of formation of suitable stars (stars such as the Sun)
  • fp = The fraction of those stars with planets (current evidence indicates that planetary systems may be common for stars like the Sun)
  • ne = The number of Earth-sized worlds per planetary system
  • fl = The fraction of those Earth-sized planets where life actually develops
  • fi = The fraction of life sites where intelligence develops
  • fc = The fraction of communicative planets (those on which electromagnetic communications technology develops)
  • L = The "lifetime" of communicating civilizations

However, whilst the rationale behind the equation is sound, it is unlikely that the equation will be constrained to reasonable limits of error any time soon. The problem with the formula is that it is not used to generate or support hypotheses because it contains factors that can never be verified. The first term, R*, number of stars, is generally constrained within a few orders of magnitude. The second and third terms, fp, stars with planets and fe, planets with habitable conditions, are being evaluated for the star's neighborhood. Drake originally formulated the equation merely as an agenda for discussion at the Green Bank conference, but some applications of the formula had been taken literally and related to simplistic or pseudoscientific arguments. Another associated topic is the Fermi paradox, which suggests that if intelligent life is common in the universe, then there should be obvious signs of it.

Another active research area in astrobiology is planetary system formation. It has been suggested that the peculiarities of the Solar System (for example, the presence of Jupiter as a protective shield) may have greatly increased the probability of intelligent life arising on Earth.

Biology

Hydrothermal vents support extremophile bacteria on Earth, provided an energy-rich environment for the origin of life, and may also support life in other parts of the cosmos.

Biology cannot state that a process or phenomenon, by being mathematically possible, has to exist forcibly in an extraterrestrial body. Biologists specify what is speculative and what is not. The discovery of extremophiles, organisms able to survive in extreme environments, became a core research element for astrobiologists, as they are important to understand four areas in the limits of life in planetary context: the potential for panspermia, forward contamination due to human exploration ventures, planetary colonization by humans, and the exploration of extinct and extant extraterrestrial life.

Until the 1970s, life was thought to be entirely dependent on energy from the Sun. Plants on Earth's surface capture energy from sunlight to photosynthesize sugars from carbon dioxide and water, releasing oxygen in the process that is then consumed by oxygen-respiring organisms, passing their energy up the food chain. Even life in the ocean depths, where sunlight cannot reach, was thought to obtain its nourishment either from consuming organic detritus rained down from the surface waters or from eating animals that did. The world's ability to support life was thought to depend on its access to sunlight. However, in 1977, during an exploratory dive to the Galapagos Rift in the deep-sea exploration submersible Alvin, scientists discovered colonies of giant tube worms, clams, crustaceans, mussels, and other assorted creatures clustered around undersea volcanic features known as black smokers. These creatures thrive despite having no access to sunlight, and it was soon discovered that they form an entirely independent ecosystem. Although most of these multicellular lifeforms need dissolved oxygen (produced by oxygenic photosynthesis) for their aerobic cellular respiration and thus are not completely independent from sunlight by themselves, the basis for their food chain is a form of bacterium that derives its energy from oxidization of reactive chemicals, such as hydrogen or hydrogen sulfide, that bubble up from the Earth's interior. Other lifeforms entirely decoupled from the energy from sunlight are green sulfur bacteria which are capturing geothermal light for anoxygenic photosynthesis or bacteria running chemolithoautotrophy based on the radioactive decay of uranium. This chemosynthesis revolutionized the study of biology and astrobiology by revealing that life need not be sunlight-dependent; it only requires water and an energy gradient in order to exist.

Biologists have found extremophiles that thrive in ice, boiling water, acid, alkali, the water core of nuclear reactors, salt crystals, toxic waste and in a range of other extreme habitats that were previously thought to be inhospitable for life. This opened up a new avenue in astrobiology by massively expanding the number of possible extraterrestrial habitats. Characterization of these organisms, their environments and their evolutionary pathways, is considered a crucial component to understanding how life might evolve elsewhere in the universe. For example, some organisms able to withstand exposure to the vacuum and radiation of outer space include the lichen fungi Rhizocarpon geographicum and Rusavskia elegans, the bacterium Bacillus safensisDeinococcus radioduransBacillus subtilis, yeast Saccharomyces cerevisiae, seeds from Arabidopsis thaliana ('mouse-ear cress'), as well as the invertebrate animal Tardigrade. While tardigrades are not considered true extremophiles, they are considered extremotolerant microorganisms that have contributed to the field of astrobiology. Their extreme radiation tolerance and presence of DNA protection proteins may provide answers as to whether life can survive away from the protection of the Earth's atmosphere.[87]

In addition to their role as analogues for potential extraterrestrial life, extremophiles are also being investigated for their potential use in space biotechnology and in in-situ resource utilization (ISRU). Microorganisms capable of biomining and bioleaching, for example, could support the extraction of metals and nutrients from planetary regolith or asteroid material, contributing to sustainable human exploration. Such applications highlight that astrobiology is not only concerned with detecting life elsewhere but also with harnessing biological processes to enable space exploration. Tonietti et al. (2023) have discussed the relevance of biomining and bioleaching research within the broader framework of astrobiology and ISRU strategies. Cockell et al. (2020) demonstrated in the International Space Station BioRock experiment that rare earth elements can be bioleached from basalt under microgravity and Mars gravity conditions, confirming that microbial metabolisms can operate in extraterrestrial environments. Santomartino et al. (2022) outlined the principles of space biomining, including bioleaching, soil formation, waste recycling, and energy production, emphasizing the role of microorganisms as "the smallest space miners". A subsequent review further developed a roadmap for sustainable space exploration based on microbial processes such as biomining, bioremediation, and biomanufacturing. More broadly, the concept of "applied astrobiology" has been proposed as an integrated framework that connects fundamental questions about life in the universe with biotechnological applications for human space exploration.

In addition to extremophile research, quantum-chemical studies have shown that organic molecules produced by living systems generally display narrower HOMO–LUMO gaps than those formed abiotically, with this distinction sharpened among more water-soluble compounds. Such gap measurements are thus emerging as a promising electronic biosignature for distinguishing biotic from abiotic chemistries in future life-detection missions.

Jupiter's moon, Europa, and Saturn's moon, Enceladus, are now considered the most likely locations for extant extraterrestrial life in the Solar System due to their subsurface water oceans where radiogenic and tidal heating enables liquid water to exist.

The origin of life, known as abiogenesis, distinct from the evolution of life, is another ongoing field of research. Oparin and Haldane postulated that the conditions on the early Earth were conducive to the formation of organic compounds from inorganic elements and thus to the formation of many of the chemicals common to all forms of life we see today. The study of this process, known as prebiotic chemistry, has made some progress, but it is still unclear whether or not life could have formed in such a manner on Earth. The alternative hypothesis of panspermia is that the first elements of life may have formed on another planet with even more favorable conditions (or even in interstellar space, asteroids, etc.) and then have been carried over to Earth.

The cosmic dust permeating the universe contains complex organic compounds ("amorphous organic solids with a mixed aromatic-aliphatic structure") that could be created naturally, and rapidly, by stars. Further, a scientist suggested that these compounds may have been related to the development of life on Earth and said that, "If this is the case, life on Earth may have had an easier time getting started as these organics can serve as basic ingredients for life."

More than 20% of the carbon in the universe may be associated with polycyclic aromatic hydrocarbons (PAHs), possible starting materials for the formation of life. PAHs seem to have been formed shortly after the Big Bang, are widespread throughout the universe, and are associated with new stars and exoplanets. PAHs are subjected to interstellar medium conditions and are transformed through hydrogenation, oxygenation and hydroxylation, to more complex organics—"a step along the path toward amino acids and nucleotides, the raw materials of proteins and DNA, respectively".

In October 2020, astronomers proposed the idea of detecting life on distant planets by studying the shadows of trees at certain times of the day to find patterns that could be detected through observation of exoplanets.

Philosophy

David Grinspoon called astrobiology a field of natural philosophy. Astrobiology intersects with philosophy by raising questions about the nature and existence of life beyond Earth. Philosophical implications include the definition of life itself, issues in the philosophy of mind and cognitive science in case intelligent life is found, epistemological questions about the nature of proof, ethical considerations of space exploration, along with the broader impact of discovering extraterrestrial life on human thought and society.

Dunér has emphasized philosophy of astrobiology as an ongoing existential exercise in individual and collective self-understanding, whose major task is constructing and debating concepts such as the concept of life. Key issues, for Dunér, are questions of resource money and monetary planning, epistemological questions regarding astrobiological knowledge, linguistics issues about interstellar communication, cognitive issues such as the definition of intelligence, along with the possibility of interplanetary contamination. Persson also emphasized key philosophical questions in astrobiology. They include ethical justification of resources, the question of life in general, the epistemological issues and knowledge about being alone in the universe, ethics towards extraterrestrial life, the question of politics and governing uninhabited worlds, along with questions of ecology.

For von Hegner, the question of astrobiology and the possibility of astrophilosophy differs. For him, the discipline needs to bifurcate into astrobiology and astrophilosophy since discussions made possible by astrobiology, but which have been astrophilosophical in nature, have existed as long as there have been discussions about extraterrestrial life. Astrobiology is a self-corrective interaction among observation, hypothesis, experiment, and theory, pertaining to the exploration of all natural phenomena. Astrophilosophy consists of methods of dialectic analysis and logical argumentation, pertaining to the clarification of the nature of reality. Šekrst argues that astrobiology requires the affirmation of astrophilosophy, but not as a separate cognate to astrobiology. The stance of conceptual speciesm, according to Šekrst, permeates astrobiology since the very name astrobiology tries to talk about not just biology, but about life in a general way, which includes terrestrial life as a subset. This leads us to either redefine philosophy, or consider the need for astrophilosophy as a more general discipline, to which philosophy is just a subset that deals with questions such as the nature of the human mind and other anthropocentric questions.

Most of the philosophy of astrobiology deals with two main questions: the question of life and the ethics of space exploration. Kolb specifically emphasizes the question of viruses, for which the question whether they are alive or not is based on the definitions of life that include self-replication. Schneider tried to defined exo-life, but concluded that we often start with our own prejudices and that defining extraterrestrial life seems futile using human concepts. For Dick, astrobiology relies on metaphysical assumption that there is extraterrestrial life, which reaffirms questions in the philosophy of cosmology, such as fine-tuning or the anthropic principle.

Rare Earth hypothesis

The Rare Earth hypothesis postulates that multicellular life forms found on Earth may actually be more of a rarity than scientists assume. According to this hypothesis, life on Earth (and more, multi-cellular life) is possible because of a conjunction of the right circumstances (galaxy and location within it, planetary system, star, orbit, planetary size, atmosphere, etc.); and the chance for all those circumstances to repeat elsewhere may be rare. It provides a possible answer to the Fermi paradox which wonders: if extraterrestrial aliens are common, why are they not obvious? It is apparently in opposition to the principle of mediocrity, assumed by famed astronomers Frank Drake, Carl Sagan, and others. The principle of mediocrity suggests that life on Earth is not exceptional, and it is more than likely to be found on innumerable other worlds.

Missions

Research into the environmental limits of life and the workings of extreme ecosystems is ongoing, enabling researchers to better predict what planetary environments might be most likely to harbor life. Missions such as the Phoenix lander, Mars Science Laboratory, ExoMars, Mars 2020 rover to Mars, and the Cassini probe to Saturn's moons aim to further explore the possibilities of life on other planets in the Solar System.

Viking program

The two Viking landers each carried four types of biological experiments to the surface of Mars in the late 1970s. These were the only Mars landers to carry out experiments looking specifically for metabolism by current microbial life on Mars. The landers used a robotic arm to collect soil samples into sealed test containers on the craft. The two landers were identical, so the same tests were carried out at two places on Mars' surface; Viking 1 near the equator and Viking 2 further north. The result was inconclusive, and is still disputed by some scientists.

Norman Horowitz was the chief of the Jet Propulsion Laboratory bioscience section for the Mariner and Viking missions from 1965 to 1976. Horowitz considered that the great versatility of the carbon atom makes it the element most likely to provide solutions, even exotic solutions, to the problems of survival of life on other planets. However, he also considered that the conditions found on Mars were incompatible with carbon based life.

Beagle 2
Replica of the 33.2 kg Beagle-2 lander
Mars Science Laboratory rover concept artwork

Beagle 2 was an unsuccessful British Mars lander that formed part of the European Space Agency's 2003 Mars Express mission. Its primary purpose was to search for signs of life on Mars, past or present. Although it landed safely, it was unable to correctly deploy its solar panels and telecom antenna.

EXPOSE

EXPOSE is a multi-user facility mounted in 2008 outside the International Space Station dedicated to astrobiology. EXPOSE was developed by the European Space Agency (ESA) for long-term spaceflights that allow exposure of organic chemicals and biological samples to outer space in low Earth orbit.

Mars Science Laboratory

The Mars Science Laboratory (MSL) mission landed the Curiosity rover that is currently in operation on Mars. It was launched 26 November 2011, and landed at Gale Crater on 6 August 2012. Mission objectives are to help assess Mars' habitability and in doing so, determine whether Mars is or has ever been able to support life, collect data for a future human mission, study Martian geology, its climate, and further assess the role that water, an essential ingredient for life as we know it, played in forming minerals on Mars.

Tanpopo

The Tanpopo mission is an orbital astrobiology experiment investigating the potential interplanetary transfer of life, organic compounds, and possible terrestrial particles in the low Earth orbit. The purpose is to assess the panspermia hypothesis and the possibility of natural interplanetary transport of microbial life as well as prebiotic organic compounds. Early mission results show evidence that some clumps of microorganism can survive for at least one year in space. This may support the idea that clumps greater than 0.5 millimeters of microorganisms could be one way for life to spread from planet to planet.

ExoMars rover
ExoMars rover model

ExoMars is a robotic mission to Mars to search for possible biosignatures of Martian life, past or present. This astrobiological mission was under development by the European Space Agency (ESA) in partnership with the Russian Federal Space Agency (Roscosmos); it was planned for a 2022 launch; however, technical and funding issues and the Russian invasion of Ukraine have forced ESA to repeatedly delay the rover's delivery to 2028.

Mars 2020
Artist's rendition of the Perseverance rover on Mars, with the mini-helicopter Ingenuity in front

Mars 2020 successfully landed its rover Perseverance in Jezero Crater on 18 February 2021. It will investigate environments on Mars relevant to astrobiology, investigate its surface geological processes and history, including the assessment of its past habitability and potential for preservation of biosignatures and biomolecules within accessible geological materials. The Science Definition Team is proposing the rover collect and package at least 31 samples of rock cores and soil for a later mission to bring back for more definitive analysis in laboratories on Earth. The rover could make measurements and technology demonstrations to help designers of a human expedition understand any hazards posed by Martian dust and demonstrate how to collect carbon dioxide (CO2), which could be a resource for making molecular oxygen (O2) and rocket fuel.

Europa Clipper

Europa Clipper is a mission launched by NASA on 14 October 2024 that will conduct detailed reconnaissance of Jupiter's moon Europa beginning in 2030, and will investigate whether its internal ocean could harbor conditions suitable for life. It will also aid in the selection of future landing sites.

Dragonfly

Dragonfly is a NASA mission scheduled to land on Titan in 2036 to assess its microbial habitability and study its prebiotic chemistry. Dragonfly is a rotorcraft lander that will perform controlled flights between multiple locations on the surface, which allows sampling of diverse regions and geological contexts.

Proposed concepts

Icebreaker Life

Icebreaker Life is a lander mission that was proposed for NASA's Discovery Program for the 2021 launch opportunity, but it was not selected for development. It would have had a stationary lander that would be a near copy of the successful 2008 Phoenix and it would have carried an upgraded astrobiology scientific payload, including a 1-meter-long core drill to sample ice-cemented ground in the northern plains to conduct a search for organic molecules and evidence of current or past life on Mars. One of the key goals of the Icebreaker Life mission is to test the hypothesis that the ice-rich ground in the polar regions has significant concentrations of organics due to protection by the ice from oxidants and radiation.

Journey to Enceladus and Titan

Journey to Enceladus and Titan (JET) is an astrobiology mission concept to assess the habitability potential of Saturn's moons Enceladus and Titan by means of an orbiter.

Enceladus Life Finder

Enceladus Life Finder (ELF) is a proposed astrobiology mission concept for a space probe intended to assess the habitability of the internal aquatic ocean of Enceladus, Saturn's sixth-largest moon.

Life Investigation For Enceladus

Life Investigation For Enceladus (LIFE) is a proposed astrobiology sample-return mission concept. The spacecraft would enter into Saturn orbit and enable multiple flybys through Enceladus' icy plumes to collect icy plume particles and volatiles and return them to Earth on a capsule. The spacecraft may sample Enceladus' plumes, the E ring of Saturn, and the upper atmosphere of Titan.

Oceanus

Oceanus is an orbiter proposed in 2017 for the New Frontiers mission No. 4. It would travel to the moon of Saturn, Titan, to assess its habitabilityOceanus' objectives are to reveal Titan's organic chemistry, geology, gravity, topography, collect 3D reconnaissance data, catalog the organics and determine where they may interact with liquid water.

Explorer of Enceladus and Titan

Explorer of Enceladus and Titan (E2T) is an orbiter mission concept that would investigate the evolution and habitability of the Saturnian satellites Enceladus and Titan. The mission concept was proposed in 2017 by the European Space Agency.

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