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This is an accepted version of this page This is the latest accepted revision, reviewed on 15 January 2025. 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 ...
The firstborn hypothesis is a special case of the Hart–Tipler conjecture (the idea that the lack of evidence for interstellar probes is evidence that no intelligent life other than humanity exists in the universe) which asserts a time-dependent curve towards discovery. [1]
f i = the fraction of planets with life that go on to develop intelligent life (civilizations). f c = the fraction of civilizations that develop a technology that releases detectable signs of their existence into space. L = the length of time for which such civilizations release detectable signals into space. [6] [7]
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Even in today's world, there can be a diverse population of bacteria found inhabiting the area surrounding these hydrothermal vents [64] which can suggest that some form of life can be supported even in the harshest of environments like the other planets in the solar system.
The anthropic principle, also known as the observation selection effect, is the proposition that the range of possible observations that could be made about the universe is limited by the fact that observations are only possible in the type of universe that is capable of developing intelligent life.