The Fermi paradox is the discrepancy between the lack of conclusive evidence of advanced extraterrestrial life and the apparently high likelihood of its existence. Those affirming the paradox generally conclude that if the conditions required for life to arise from non-living matter are as permissive as the available evidence on Earth indicates, then extraterrestrial life would be sufficiently common such that it would be implausible for it not to have been detected yet.
Space exploration is the use of astronomy and space technology to explore outer space. While the exploration of space is currently carried out mainly by astronomers with telescopes, its physical exploration is conducted both by uncrewed robotic space probes and human spaceflight. Space exploration, like its classical form astronomy, is one of the main sources for space science.
The following outline is provided as an overview and topical guide to space science:
Space colonization is the process of establishing human settlements beyond Earth. This is commonly for prestige, commercial or strategic benefit. This is in contrast to space exploration for scientific benefit. Colonialism can involve exploitation of both resources and people by a distant entity.
The Great Filter is the idea that, in the development of life from the earliest stages of abiogenesis to reaching the highest levels of development on the Kardashev scale, there is a barrier to development that makes detectable extraterrestrial life exceedingly rare. The Great Filter is one possible resolution of the Fermi paradox.
Space advocacy is supporting or advocating human activity in outer space. The advocated purposes range from orbital flight, space exploration, commercialization of space and space settlement, to outright space colonization.
Human extinction or omnicide is the hypothetical end of the human species, either by population decline due to extraneous natural causes, such as an asteroid impact or large-scale volcanism, or via anthropogenic destruction (self-extinction), for example by sub-replacement fertility.
The colonization of Mars is the proposed process of establishing and maintaining control of Martian land for exploitation and the possible settlement of Mars. Most colonization concepts focus on settling, but colonization is a broader ethical concept, which international space law has limited, and national space programs have avoided, instead focusing on human mission to Mars for exploring the planet. The settlement of Mars would require the migration of humans to the planet, the establishment of a permanent human presence, and the exploitation of local resources.
Our Final Hour is a 2003 book by the British Astronomer Royal Sir Martin Rees. The full title of the book is Our Final Hour: A Scientist's Warning: How Terror, Error, and Environmental Disaster Threaten Humankind's Future In This Century—On Earth and Beyond. It was published in the United Kingdom under the title Our Final Century: Will the Human Race Survive the Twenty-first Century?.
The Future of Humanity Institute (FHI) was an interdisciplinary research centre at the University of Oxford investigating big-picture questions about humanity and its prospects. It was founded in 2005 as part of the Faculty of Philosophy and the Oxford Martin School. Its director was philosopher Nick Bostrom, and its research staff included futurist Anders Sandberg and Giving What We Can founder Toby Ord.
Pale Blue Dot: A Vision of the Human Future in Space is a 1994 book by the astronomer Carl Sagan. It is the sequel to Sagan's 1980 book Cosmos and was inspired by the famous 1990 Pale Blue Dot photograph, for which Sagan provides a poignant description. In the book, Sagan mixes philosophy about the human place in the universe with a description of the current knowledge about the Solar System. He also details a human vision for the future.
A global catastrophic risk or a doomsday scenario is a hypothetical event that could damage human well-being on a global scale, even endangering or destroying modern civilization. An event that could cause human extinction or permanently and drastically curtail humanity's existence or potential is known as an "existential risk".
Human presence in space is the direct and mediated presence or telepresence of humans in outer space and in a broader sense also on any extraterrestrial astronomical body. Human presence in space, particularly through mediation, can take many physical forms from space debris, uncrewed spacecraft, artificial satellites, space observatories, crewed spacecraft, art in space, to human outposts in outer space such as space stations.
Existential risk from artificial intelligence refers to the idea that substantial progress in artificial general intelligence (AGI) could lead to human extinction or an irreversible global catastrophe.
On the Future: Prospects for Humanity is a 2018 nonfiction book by British cosmologist and Astronomer Royal Martin Rees. It is a short, "big concept" book on the future of humanity and on potential dangers, such as nuclear warfare, climate change, biotech, and artificial intelligence, and the possibility of human extinction.
The Precipice: Existential Risk and the Future of Humanity is a 2020 non-fiction book by the Australian philosopher Toby Ord, a senior research fellow at the Future of Humanity Institute in Oxford. It argues that humanity faces unprecedented risks over the next few centuries and examines the moral significance of safeguarding humanity's future.
Risks of astronomical suffering, also called suffering risks or s-risks, are risks involving much more suffering than all that has occurred on Earth so far. They are sometimes categorized as a subclass of existential risks.
Scenarios in which a global catastrophic risk creates harm have been widely discussed. Some sources of catastrophic risk are anthropogenic, such as global warming, environmental degradation, and nuclear war. Others are non-anthropogenic or natural, such as meteor impacts or supervolcanoes. The impact of these scenarios can vary widely, depending on the cause and the severity of the event, ranging from temporary economic disruption to human extinction. Many societal collapses have already happened throughout human history.
Space ethics, astroethics or astrobioethics is a discipline of applied ethics that discusses the moral and ethical implications arising from astrobiological research, space exploration and space flight. It deals with practical contemporary issues like the protection of the space environment and hypothetical future issues pertaining to our interaction with extraterrestrial life forms.
Existential risk studies (ERS) is a field of studies focused on the definition and theorization of "existential risks", its ethical implications and the related strategies of long-term survival. Existential risks are diversely defined as global kinds of calamity that have the capacity of inducing the extinction of intelligent earthling life, such as humans, or, at least, a severe limitation of their potential, as defined by ERS theorists. The field development and expansion can be divided in waves according to its conceptual changes as well as its evolving relationship with related fields and theories, such as futures studies, disaster studies, AI safety, effective altruism and longtermism.
