Ancient, massive asteroid impact could explain Martian geological mysteries
Date:
July 18, 2017
Source:
University of Colorado at Boulder
Summary:
A colossal impact with a large asteroid early in Mars' history may have ripped off a chunk of the northern hemisphere and left behind a legacy of metallic elements in the planet's interior. The crash also created a ring of rocky debris around Mars that may have later clumped together to form its moons, Phobos and Deimos.
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https://www.sciencedaily.com/releases/2017/07/170718113716.htm