Is There Water on Other Planets?

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If Earth formed with its water or at least some of its water, then anywhere that you form a rocky planet in any solar system could be supporting life. The more we look at extraterrestrial materials from other planets and other solar system bodies, the more we realize that there's water everywhere. So it's something that's everywhere and if that is important for life, then it's kind of revolutionary really to know that water's so common.

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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