Ancient, massive asteroid impact could explain Martian geological mysteries
Tuesday, July 18, 2017 - 11:52
in Astronomy & Space
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.