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Molten Earth
- Early Earth was a molten magma marble, too hot for liquid water.
- The question arises: how did so much water condense on such a hot planet?
Comet Theory
- The classical theory suggests water arrived after Earth cooled, possibly from comets.
- Scientists can analyze water's "fingerprint" by examining the ratio of hydrogen to deuterium.
Water Fingerprints
- The ratio of normal hydrogen to deuterium in water acts as a fingerprint, revealing its origin.
- This fingerprint doesn't match between Earth's water and comets, disproving the comet theory.


