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Origins: How did Earth get its water?
Unexplainable
The Significance of Comet Water
All water comes with a particular signature, a kind of fingerprint. In the H2O, you just look at the H. Hydrogen is actually really useful for tracing where water came from. But that fingerprint in Earth's water doesn't match comets. We need to get that water from somewhere else. A lot of models suggest that Jupiter and Saturn moved right in towards where Earth is orbiting now. And then they went back out again.
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