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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 ...
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.
It is unclear if life and intelligent life are ubiquitous in the cosmos or rare. The hypothesis of ubiquitous extraterrestrial life relies on three main ideas. The first one, the size of the universe allows for plenty of planets to have a similar habitability to Earth, and the age of the universe gives enough time for a long process analog to ...
The chance that higher life forms might have emerged in this way is comparable to the chance that a tornado sweeping through a junkyard might assemble a Boeing 747 from the materials therein. This echoes his stance, reported elsewhere: Life as we know it is, among other things, dependent on at least 2000 different enzymes.
"Life's a climb. But the view is great." There are times when things seemingly go to plan, and there are other moments when nothing works out. During those instances, you might feel lost.
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]
At the end of the Q&A, Fonda asked her friend whether she sees any signs of intelligent life in the universe at the moment, to which Tomlin replied, “Well, golly …
n e = 1 to 5 (stars with planets will have between 1 and 5 planets capable of developing life) f l = 1 (100% of these planets will develop life) f i = 1 (100% of which will develop intelligent life) f c = 0.1 to 0.2 (10–20% of which will be able to communicate) L = somewhere between 1000 and 100,000,000 years