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Planetary scientists have been working on this issue many years and the answers have changed, at least until recently. We’re pretty sure that the water did not originate at the same distance from the sun which is now the Earth, which is 1 AU (Astronomical Unit). It is thought that the solar nebula from which all the planets were formed, would have been too hot at that distance to the water to condense. Besides water vapor does not react fast e
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