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This all-new special is an “Encyclopedia Galactica” of non-Earth life forms, and an investigation into the latest scientific understanding of life beyond planet Earth.
ALIENS: THE DEFINITIVE GUIDE showcases the extraordinary scientists who are currently grappling with extraordinary questions about alien life including: what will aliens really look like?; how will they sound?; what might their words look like; and, of course, will they come in peace?
This two-part special takes viewers to stunning, remote locations on Earth as well as elsewhere in the universe.
Originally posted by Worldablaze420
for those who dont think that alien life exists, im sorry but you are either uneducated or extremely closed minded,. wake up! the universe is infinitely large for all we know. its a simple math problem. the drake equation...
Originally posted by greatfriendbadfoe
... Probability hints towards yes, but there is still NO solid proof.
Drake equation blah!
Originally posted by PhoenixOD
reply to post by Outrageo
Until we find ANY sign of life apart from the 1 case of abiogenesis we have observed on this planet so far the probability of life existing elsewhere in the universe is :
1 in (all the planets in all the galaxies in the universe)
Thats a probability so so small its not even worth contemplating. But even with such a small chance of it happening i hope its out there
Certainly one of the most intriguing and important still-unanswered questions is whether we are alone in the Universe. Author Amir Aczel contends  that the probability that intelligent life is present somewhere else in the Universe is virtually 1. His argument is based on the simple binomial probability model below: Suppose that for each star in the Universe other than our own there is a certain probability p that intelligent life has originated and currently exists in a planetary system encircling that star. (We ignore the ambiguity regarding the concept of "currently" that arises from Einstein's Theory of Relativity for stars at great distances from Earth.) It seems reasonable to assume that the origination of intelligent life around one star is independent of whether it has originated near any other star. Thus if n is the number of stars in the Universe then the chance that intelligent life exists nowhere else than on Earth is (1 - p)^n. Now n is known to be approximately of the order 10^22.
Even if p is extremely small, the above expression will be close to 0. Aczel claims a value for p of around 10^-14, in which case the probability that alien intelligent life does exist is 1 - (1 - 10^-14)^(10^22) = .9999..., a number beginning with approximately forty-three million 9's. Aczel's rationale for his choice of p is not convincing, and in actuality it is not within our current scientific capabilities to come up with a good estimate of p. Nevertheless the argument above implies that the odds in favor of intelligent life outside of our own planet are overwhelming unless the chances of such life around a randomly selected star are exceedingly small, specifically, less than 10^22 or so (do you see why?). Several recent discoveries favor a "large" p rather than a small one, however. Specifically, the lifelike structures contained in the Martian meteorite found in Antarctica and the increasing number of probable nearby planetary systems that have been detected by astronomers both support a larger value of p than might previously have been conjectured.
Aliens, Asteroids, and Astronomical Odds - PDF
WRONG. Your probability only applies if the population : (all the planets in all the galaxies - 1) are lifeless. Since we do not know if there is life on those planets the probability has to be looked at differently. What we have is a SAMPLE of 1 out of trillions and that sample of 1 has a specific property : life. What is the probability that a sample of 1 out of trillions is unique. The odds are so staggering that the proibability of life is practically 1.