Early Earth Bombarded By Comets NOVA

Premiered August 25, 2014
Early Earth Bombarded By Comets

Comets carrying chemicals necessary for life may have come to Earth billions of years ago.

About the Program

NOVA

NOVA brings you stories from the frontlines of science and engineering, answering the big questions of today and tomorrow, from how our ancestors lived, to whether parallel universes exist, to how technology will transform our lives. Visit the official website to watch full-length documentaries, or explore our world through short-form video, on our digital publication NOVA Next.

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