Is There a Water Supply From a Wandering Jupiter?

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There is chemical evidence to suggest that the very earliest Earth may have had oceans. So it's possible that even without that improbable water delivery from a wandering Jupiter, Earth could have become a blue marble. We don't think it's too long after Earth formed that there's liquid water present on Earth.

Life as we know it needs water, but scientists can’t figure out where Earth’s water came from. Answering that question is just one piece of an even bigger mystery: “Why are we here?”

This is the first episode in our new three-part series, Origins, about the beginnings and boundaries of life on Earth.

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