Question

In three to five sentences, explain the evidence that supports the idea that water on Earth may have come from comets.

Answer 1

The main evidence that supports the claim that water on planet Earth came from asteroids is the presence of certain water isotopes.

Scientists believe water on Earth may have originated from asteroids. The current main evidence for this is the presence of water isotopes on Earth with the same distribution as those on Vesta. Vesta is the second-largest asteroid near Earth, this equal distribution provides a strong claim that the isotopes for water on Earth may have an extraterrestrial origin.

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