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  • Extraterrestrial life

    Extraterrestrial life

    • This piglix contains articles or sub-piglix about Extraterrestrial life

    • Fermi paradox

    • This piglix contains articles or sub-piglix about Fermi paradox


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    • Habitable zone planets

    • This piglix contains articles or sub-piglix about Habitable zone planets


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    • Paranormal topics related to extraterrestrial life

    • This piglix contains articles or sub-piglix about Paranormal topics related to extraterrestrial life


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    • Extraterrestrial life in popular culture

    • This piglix contains articles or sub-piglix about Extraterrestrial life in popular culture


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    • Search for extraterrestrial intelligence

    • This piglix contains articles or sub-piglix about Search for extraterrestrial intelligence


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    • Extraterrestrial life

    • Extraterrestrial life, also called alien life (or, if it is a sentient or relatively complex individual, an "extraterrestrial" or "alien"), is life that does not originate from Earth. These as-yet-hypothetical life forms may range from simple single-celled organisms to beings with civilizations far more advanced than h ... Read »


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    • Alien abduction

    • The terms alien abduction or abduction phenomenon describe "subjectively real memories of being taken secretly against one's will by apparently nonhuman entities and subjected to complex physical and psychological procedures". Such abductions have sometimes been classified as close encounters of the fourth kind. People ... Read »


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    • Alien language

    • Exolinguistics (also called xenolinguistics and astrolinguistics) is the study of the hypothetical languages of alien species. The question of what form an alien language might take, and whether humans would recognize it as a language if they encountered it, has been approached from several perspectives. Consideration ... Read »


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    • Alien visitation

    • Throughout history, some people have claimed experiences that are the supposed results of alien visitation. While some of the factors of extraterrestrial visits range in variety, the basic structure stays the same, motivating further research into the topic. Alien visitation refers to an intentional encounter between ... Read »


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    • Allan Hills 84001

    • Allan Hills 84001

      Allan Hills 84001 (commonly abbreviated ALH84001) is a meteorite that was found in Allan Hills, Antarctica on December 27, 1984 by a team of U.S. meteorite hunters from the ANSMET project. Like other members of the group of SNCs (shergottite, nakhlite, chassignite), ALH84001 is thought to be from Mars. However, it does ... Read »


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    • Astrobiology

    • Astrobiology is the study of the origin, evolution, distribution, and future of life in the universe: extraterrestrial life and life on Earth. Astrobiology addresses the question of whether life exists beyond Earth, and how humans can detect it if it does (the term exobiology is similar but more specific—it covers ... Read »


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    • Azotosome

    • An azotosome (classical compound of "azote", French for nitrogen, and "soma", Greek for body) is a theoretical membrane that could possibly serve as the basis for a cell membrane of a hypothetical methane–ethane-based living cell, analogous to the phospholipid bilayers found in all water-based life on Earth. Unlik ... Read »


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    • Carbon chauvinism

    • Carbon chauvinism is a neologism meant to disparage the assumption that the chemical processes of hypothetical extraterrestrial life must be constructed primarily from carbon (organic compounds) because carbon's chemical and thermodynamic properties render it far superior to all other elements. The term was used a ... Read »


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    • Circumstellar habitable zone

    • In astronomy and astrobiology, the circumstellar habitable zone (CHZ), or simply the habitable zone, is the range of orbits around a star within which a planetary surface can support liquid water given sufficient atmospheric pressure. The bounds of the CHZ are based on Earth's position in the Solar System and the amoun ... Read »


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    • Communication with extraterrestrial intelligence

    • Communication with extraterrestrial intelligence (CETI) is a branch of the search for extraterrestrial intelligence that focuses on composing and deciphering messages that could theoretically be understood by another technological civilization. The best-known CETI experiment was the 1974 Arecibo message composed by Fra ... Read »


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    • Cosmic pluralism

    • Cosmic pluralism, the plurality of worlds, or simply pluralism, describes the philosophical belief in numerous "worlds" (planets, dwarf planets or natural satellites) in addition to Earth (possibly an infinite number), which may harbour extraterrestrial life. The debate over pluralism began as early as the time of Ana ... Read »


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    • Potential cultural impact of extraterrestrial contact

    • The cultural impact of extraterrestrial contact is the corpus of changes to terrestrial science, technology, religion, politics, and ecosystems resulting from contact with an extraterrestrial civilization. It is closely related to the search for extraterrestrial intelligence (SETI), which attempts to locate intelligent ... Read »


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    • Exotheology

    • The term "exotheology" was coined in the 1960s or early 1970s for the examination of theological issues as they pertain to extraterrestrial intelligence. It is primarily concerned with either conjecture about possible theological beliefs that extraterrestrials might have, or how our own theologies have been or will be ... Read »


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    • Exposing Microorganisms in the Stratosphere

    • Exposing Microorganisms in the Stratosphere (E-MIST) is a NASA study to determine if microorganisms could survive conditions like those on the planet Mars. The study will transport bacteria by helium-filled scientific balloon to the stratosphere of Earth and monitor the ability of the microorganisms to survive in such ... Read »


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    • Extra-Terrestrial Exposure Law

    • The Extra-Terrestrial Exposure Law (14 C.F.R. 1211 of the Code of Federal Regulations) was the popular name for regulations adopted by the National Aeronautics and Space Administration (NASA) in 1969 to formalize its "policy, responsibility and authority to guard the Earth against any harmful contamination … resul ... Read »


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    • Extraterrestrial hypothesis

    • The extraterrestrial hypothesis (ETH) proposes that some unidentified flying objects (UFOs) are best explained as being physical spacecraft occupied by extraterrestrial life or non-human aliens from other planets visiting Earth. As yet, no evidence exists to support this hypothesis. Origins of the term extraterres ... Read »


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    • Extraterrestrial intelligence

    • Extraterrestrial intelligence (often abbreviated ETI) refers to hypothetical intelligent extraterrestrial life. The question of whether other inhabited worlds might exist has been debated since ancient times. The modern form of the concept emerged when the Copernican Revolution demonstrated that the Earth was a planet ... Read »


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    • Fermi paradox

    • The Fermi paradox or Fermi's paradox, named after physicist Enrico Fermi, is the apparent contradiction between the lack of evidence and high probability estimates, e.g., those given by the Drake equation, for the existence of extraterrestrial civilizations. The basic points of the argument, made by physicists Enrico F ... Read »


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    • Joe Firmage


    • Geyser (Mars)

    • Martian geysers are putative sites of small gas and dust eruptions that occur in the south polar region of Mars during the spring thaw. "Dark dune spots" and "spiders" - or araneiforms - are the two most visible types of features ascribed to these eruptions. They are unlike any terrestrial geological phenomenon. The r ... Read »


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    • Great Filter

    • The Great Filter, in the context of the Fermi paradox, is whatever prevents "dead matter" from giving rise, in time, to "expanding lasting life". The concept originates in Robin Hanson's argument that the failure to find any extraterrestrial civilizations in the observable universe implies the possibility something is ... Read »


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    • Hypothetical types of biochemistry

    • Hypothetical types of biochemistry are forms of biochemistry speculated to be scientifically viable but not proven to exist at this time. The kinds of living organisms currently known on Earth all use carbon compounds for basic structural and metabolic functions, water as a solvent, and DNA or RNA to define and control ... Read »


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    • Interplanetary contamination

    • Interplanetary contamination refers to biological contamination of a planetary body by a space probe or spacecraft, either deliberate or unintentional. There are two types of interplanetary contamination: The main focus is on microbial life and on potentially invasive species. Non-biological forms of contamination ha ... Read »


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    • Kardashev scale

    • The Kardashev scale is a method of measuring a civilization's level of technological advancement, based on the amount of energy a civilization is able to use for communication. The scale has three designated categories: The scale is hypothetical, and regards energy consumption on a cosmic scale. It was proposed in 196 ... Read »


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    • Little green men

    • Little green men is the stereotypical portrayal of extraterrestrials as little humanoid-like creatures with green skin and sometimes with antennae on their heads. The term is also sometimes used to describe gremlins, mythical creatures known for causing problems in airplanes and mechanical devices. Today, these creatur ... Read »


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    • Life on Mars

    • The possibility of life on Mars is a subject of significant interest to astrobiology due to the planet's proximity and similarities to Earth. To date no proof has been found of past or present life on Mars. However, cumulative evidence is now building that the ancient surface environment of Mars had liquid water and ma ... Read »


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    • Martian

    • A Martian is a native inhabitant of the planet Mars. Although the search for evidence of life on Mars continues, many science fiction writers have imagined what extraterrestrial life on Mars might be like. Some writers also use the word Martian to describe a human colonist on Mars. The earliest known instances of ... Read »


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    • Metalaw

    • Metalaw is “the entire sum of legal rules regulating relationships between different races in the universe.” It is a concept of space law closely related to the scientific Search for Extraterrestrial Intelligence (SETI). The idea is an elaboration of Immanuel Kant's Categorical imperative "Act only according ... Read »


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    • The Millennial Project: Colonizing the Galaxy in Eight Easy Steps

    • The Millennial Project: Colonizing the Galaxy in Eight Easy Steps

      The Millennial Project: Colonizing the Galaxy in Eight Easy Steps by Marshall T. Savage is a book (published in 1992 and reprinted in 1994 with an introduction by Arthur C. Clarke) in the field of Exploratory engineering that gives a series of concrete stages the author believes will lead to interstellar colonization. ... Read »


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    • Neocatastrophism

    • Neocatastrophism is the hypothesis that life-exterminating events such as gamma-ray bursts have acted as a galactic regulation mechanism in the Milky Way upon the emergence of complex life in its habitable zone. It is proposed as an explanation of Fermi's paradox since it provides a mechanism which would have delayed t ... Read »


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    • Paracoccus denitrificans

    • Paracoccus denitrificans, is a coccoid bacterium known for its nitrate reducing properties, its ability to replicate under conditions of hypergravity and for being the possible ancestor of the eukaryotic (endosymbiotic theory). Paracoccus denitrificans, is a gram-negative, coccus, non-motile, denitrifying (nitrat ... Read »


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    • Pioneer 10

    • Pioneer 10

      Pioneer 10 (originally designated Pioneer F) is an American space probe, launched in 1972 and weighing 258 kilograms (569 pounds), that completed the first mission to the planet Jupiter. Thereafter, Pioneer 10 became the first spacecraft to achieve escape velocity from the Solar System. This space exploration project w ... Read »


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    • Pioneer plaque

    • The Pioneer plaques are a pair of gold-anodized aluminium plaques which were placed on board the 1972 Pioneer 10 and 1973 Pioneer 11 spacecraft, featuring a pictorial message, in case either Pioneer 10 or 11 is intercepted by extraterrestrial life. The plaques show the nude figures of a human male and female along with ... Read »


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    • Planetarium hypothesis

    • The planetarium hypothesis, conceived in 2001 by Stephen Baxter, attempts to provide a solution to the Fermi paradox by holding that our astronomical observations represent an illusion, created by a Type III civilization capable of manipulating matter and energy on galactic scales. He postulates that we do not see evid ... Read »


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    • Planetary protection

    • Planetary protection is a guiding principle in the design of an interplanetary mission, aiming to prevent biological contamination of both the target celestial body and the Earth in the case of sample-return missions. Planetary protection reflects both the unknown nature of the space environment and the desire of the s ... Read »


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    • Post-detection policy

    • A post-detection policy (PDP), also known as a post-detection , is a set of structured rules, standards, guidelines, or actions that governmental or other organizational entities plan to follow in the "detection, analysis, verification, announcement, and response to" confirmed signals from extraterrestrial civilization ... Read »


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    • Project Cyclops

    • Project Cyclops was a 1971 NASA project that investigated how SETI should be conducted. As a NASA product the report is in the public domain. The project team created a design for coordinating large numbers of radio telescopes to search for Earth-like radio signals at a distance of up to 1000 light-years to find intell ... Read »


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    • San Marino Scale

    • The San Marino Scale is a suggested scale for assessing risks associated with deliberate transmissions from Earth aimed to possible extraterrestrial intelligent life. The scale was suggested by Iván Almár at a conference in San Marino in 2005. The radio output of Jupiter, Saturn and Neptune is not considered in t ... Read »


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    • The Science of Aliens

    • The Science of Aliens is a touring exhibition that launched at the London Science Museum in October 2005. It was developed by a company called The Science of... set up by The Science Museum and Fleming Media. Two versions of the exhibition are touring venues around the world. The Science of Aliens asks the questio ... Read »


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    • Search for extraterrestrial intelligence

    • The search for extraterrestrial intelligence (SETI) is a collective term for scientific searches for intelligent extraterrestrial life, for example, monitoring electromagnetic radiation for signs of transmissions from civilizations on other worlds. There are great challenges in searching the universe for signs of inte ... Read »


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    • Shergotty meteorite

    • Shergotty meteorite

      The Shergotty meteorite is the first example of the shergottite Mars meteorite family. It was a 5-kilogram (11 lb) Martian meteorite which fell to Earth at Shergotty (now Sherghati), in the Gaya district, Bihar, India on 25 August 1865, and was retrieved by witnesses almost immediately. This meteorite is relatively ... Read »


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    • Speculative evolution

    • Speculative evolution, also called speculative biology and speculative zoology, is a genre of speculative fiction and an artistic movement, focused on hypothetical scenarios in the evolution of life. Works incorporating speculative evolution may have entirely conceptual species that evolve on a planet other than Earth, ... Read »


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    • Technosignature


    • Life on Titan

    • Whether there is life on Titan, the largest moon of Saturn, is at present an open question and a topic of scientific assessment and research. Titan is far colder than Earth, and its surface lacks stable liquid water; factors which have led some scientists to consider life there unlikely. On the other hand, its thick at ... Read »


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    • United Nations Office for Outer Space Affairs

    • United Nations Office for Outer Space Affairs

      The United Nations Office for Outer Space Affairs (UNOOSA) is a part of the United Nations Secretariat, located at the United Nations Office in Vienna. In March 2014, the Secretary-General appointed Simonetta Di Pippo (Italy) as the new Director of the Office. The United Nations Office for Outer Space Affairs was ... Read »


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    • Life on Venus

    • The speculation of life currently existing on Venus decreased significantly since the early 1960s, when spacecraft began studying Venus and it became clear that the conditions on Venus are extreme compared to those on Earth. Venus's location closer to the Sun than Earth and the extreme greenhouse effect raising temper ... Read »


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    • Xenoarchaeology

    • Xenoarchaeology is a hypothetical form of archaeology that exists mainly in works of science fiction. The field is concerned with the study of material remains to reconstruct and interpret past life-ways of alien civilizations. Xenoarchaeology is not currently practiced by mainstream archaeologists due to the current l ... Read »


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    • Zoo hypothesis

    • The zoo hypothesis speculates as to the assumed behavior and existence of technically advanced extraterrestrial life and the reasons they refrain from contacting Earth and is one of many theoretical explanations for the Fermi paradox. The hypothesis is that alien life intentionally avoids communication with Earth, and ... Read »


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