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How Did Earth Get Its Water?

If water just keeps getting recycled by a closed system on Earth, how did it get here in the first place? Where did the cycle begin?

Hosted by: Reid Reimers
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Sources:
http://spaceplace.nasa.gov/comet-ocean/en/
http://www.smithsonianmag.com/science-nature/how-did-water-come-to-earth-72037248/?no-ist
http://phys.org/news/2014-02-earth.html#jCp
http://www.bbc.com/earth/story/20150526-alien-origin-of-earths-oceans
http://news.nationalgeographic.com/news/2014/10/141030-starstruck-earth-water-origin-vesta-science/

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