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S38 Ep13: Early Earth Bombarded By Comets

Comets carrying chemicals necessary for life may have come to Earth billions of years ago.
  • Premiere Date: Aug 25th, 2014
  • Rating: TV-G
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S38 Ep13: Early Earth Bombarded By Comets

Comets carrying chemicals necessary for life may have come to Earth billions of years ago. (5:10)
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