What Is H2O?

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Water is present as H2O molecules, but it's kind of attached within the crystal structure. Lydia thinks this could have happened in the very early solar system. That even before Earth formed, solar wind would have hit the first piles of debris floating around and baked water into those rocks.

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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