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Sandeep Vivek 6 years ago
Possible basis of extraterrestrial life
Several theories have been proposed about the possible basis of alien life from a biochemical, evolutionary or morphological viewpoint.Alien life, such as bacteria, has been theorized by scientists such as Carl Sagan to exist in the Solar System and quite possibly throughout the universe. No samples have been found, although there is some controversy about possible traces of life in Martian material, of which the most famous are on the Allan Hills 84001 meteorite.
Sandeep Vivek 6 years ago
Aliens are defined as life that does not originate from Earth. It is unknown whether any such life exists, and all discussion of it must be regarded as highly speculative. Various claims have been made for evidence of its existence, such as those listed in a 2006 New Scientist article. However, the mainstream scientific community regards all such claims as unconvincing. A less direct argument for extraterrestrial life relies on the vast size of the observable universe. According to this argument, endorsed by Carl Sagan and Stephen Hawking, it would be improbable for life not to exist somewhere other than Earth.

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