NOVA

Early Earth Bombarded By Comets

Clip: Season 38 Episode 13 | 5m 10s

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

Aired: 08/25/14

Rating: TV-G

Watch Full Length

Problems Playing Video?

National corporate funding for NOVA is provided by Draper. Major funding for NOVA is provided by the David H. Koch Fund for Science, the Corporation for Public Broadcasting and PBS viewers.