When Earth got its water

Believe it or not, scientists still don’t know exactly how or when Earth got its water. Most think water must have come later, delivered by meteors or comets, but a new study suggests it may have been present from our planet’s birth. Find out why in my podcast for Scientific American’s 60 Second Science.

NASA's Dawn spacecraft snapped an image of the ancient asteroid Vesta, which holds clues about the origins of Earth's water. (Credit: NASA/JPL-Caltech/UCLA/MPS/DLR/IDA)
NASA’s Dawn spacecraft snapped an image of the ancient asteroid Vesta, which holds clues to the mystery of Earth’s water. (Credit: NASA/JPL-Caltech/UCLA/MPS/DLR/IDA)
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