We have talked a lot about water issues in this course, but we never asked "where did all of the water come from?" It turns out this is an interesting question that scientists are still investigating. Here is a link to a recent article in Time Magazine examining some new research on this question.
New Proof that Coments Watered the Earth.
http://www.time.com/time/health/article/0,8599,2096512,00.html?iid=sl-article-mostpop1
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