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Early Earth Bombarded By Comets

Comets carrying chemicals necessary for life may have come to Earth billions of years ago.
Publish Date: Topic: Space + FlightSpace & FlightNova
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Key ingredients for life may have been delivered throughout the solar system by comets and asteroids billions of years ago. The gravitational interactions of Jupiter and Saturn could have destabilized the early solar system, leading to a period in which comets and asteroids collided with objects throughout the solar system (including the early Earth). Impact craters visible on moons and planets may be evidence of this period.

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Additional funding for "Finding Life Beyond Earth" is provided by Millicent Bell, through the Millicent and Eugene Bell Foundation.

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