"What type of scientific proof is there that Earth is the only location in the universe that life has ever existed on?"
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Characterizing the Early Solar Nebula
July 7, 2005 / Posted by: Shige Abe
A recent Nature paper from Jim Lyons and Ed Young of NAI’s UCLA Lead Team postulates a cause for oxygen isotope anomalies in meteorites that overthrows a long accepted explanation. They propose CO photodissociation due to a far ultraviolet flux caused by a nearby O or B star as a mechanism to produce the isotope fractionation that is consistent with the anomalies observed in the meteorites. The postulated presence of a nearby second star (within one parsec) means statistically that the forming Solar System was probably embedded in a cluster of ~200 stars.
Source: [Link]
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