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Where Did the Earth's Water Come From? - Neatorama

A few billion years ago, our earth was a blob of molten rock that eventually formed into a water-filled planet teeming with life. Where did the earth get that water? Scientists still don't know, but they are entertaining several possibilities. The first scientific theory, and the oldest, is that our water came from comets. Yeah, that would take a lot of comets, but it was the best theory up until recently, when actual comets could be analyzed. It was found that the water in comets is not like th