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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]
Ward and Brownlee argue that the universe is fundamentally hostile to complex life and that while microbial life may be common in the universe, complex intelligent life (like the evolution of biological complexity from simple life on Earth) requires an exceptionally unlikely set of circumstances, and therefore complex life is likely to be extremely rare.
On learning "Without the method of learning, you're like a one-legged man in an ass-kicking contest. It's just not going to work very well." — 2021 Daily Journal Annual Meeting “In my whole ...
So by this argument, finding multicellular life on Mars (provided it evolved independently) would be bad news, since it would imply steps 2–6 are easy, and hence only 1, 7, 8 or 9 (or some unknown step) could be the big problem. [4] Although steps 1–8 have occurred on Earth, any one of these may be unlikely.
The Rio scale was modified in 2011 to include a consideration of whether contact was achieved through an interstellar message or through a physical extraterrestrial artifact, with a suggestion that the definition of artifact be expanded to include "technosignatures", including all indications of intelligent extraterrestrial life other than the ...
But a life built upon those things alone leaves a shallow legacy. In the end, we will be judged by other standards." 40. "If you are outraged by conditions, then you have got to do something about it.
Extraterrestrial: The First Sign of Intelligent Life Beyond Earth (also known as Extraterrestrial) [1] [2] is a popular science book written by American theoretical physicist and Harvard University astronomer Avi Loeb, [3] [4] [5] published by Houghton Mifflin Harcourt on 26 January 2021. [6] [7]