Submitted by ClienteFrecuente t3_10zvwxa in askscience
atomfullerene t1_j8e2eli wrote
Reply to comment by Brownhouse71 in From where the water in ancient Mars came? by ClienteFrecuente
Hydrogen and oxygen are common elements that were widespread during the formation of the solar system. Mix them together and you get water. Most of the hydrogen was lost off the rocky planets early in the solar system's history, but some of it got bound up in rocks ( along with a lot of oxygen) where it could be later released as water
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