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The 1967 Outer Space Treaty and the 1979 Moon Agreement define rules of planetary protection against potentially hazardous extraterrestrial life. COSPAR also provides guidelines for planetary protection. [159]
This is an accepted version of this page This is the latest accepted revision, reviewed on 24 December 2024. Problem of the lack of evidence for alien life despite its apparent likelihood This article is about the absence of clear evidence of extraterrestrial life. For a type of estimation problem, see Fermi problem. Enrico Fermi (Los Alamos 1945) The Fermi paradox is the discrepancy between ...
Planetary habitability in the Solar System is the study that searches the possible existence of past or present extraterrestrial life in those celestial bodies. As exoplanets are too far away and can only be studied by indirect means, the celestial bodies in the Solar System allow for a much more detailed study: direct telescope observation, space probes, rovers and even human spaceflight.
The "dark forest" hypothesis presumes that any space-faring civilization would view any other intelligent life as an inevitable threat and thus destroy any nascent life that makes itself known. As a result, the electromagnetic spectrum would be relatively quiet, without evidence of any intelligent alien life. [8] [9]
Regardless of its form, the theories generally propose that microbes able to survive in outer space (such as certain types of bacteria or plant spores [8]) can become trapped in debris ejected into space after collisions between planets and small solar system bodies that harbor life. [9]
A key component of the hypothesis is that Earth's solar system has not yet been visited by a Berserker probe. In a 2013 analysis by Anders Sandberg and Stuart Armstrong at the Future of Humanity Institute at University of Oxford, they predicted that even a slowly replicated set of Berserker probes, if it were able to destroy civilizations elsewhere, would also very likely have already ...
NASA discovered the most promising evidence for ancient life on Mars. ... Here are the US's biggest moments in space this year and the missions that taught us outer space is a formidable place.
The search for extraterrestrial intelligence (SETI) is a collective term for scientific searches for intelligent extraterrestrial life.Methods include monitoring electromagnetic radiation for signs of transmissions from civilizations on other planets, [1] [2] [3] optical observation, and the search for physical artifacts.
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