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Mars' Ancient Collision

(2)Scientists recently theorized that a gigantic impact created a crater over Mars' northern half, some 4.4 billion years ago, during a time when large projectiles were prevalent in the inner solar system. The object that hit Mars was estimated to be half-as-wide as Mercury. For more, including a video recreation of the impact, visit New Scientist(1).

1. http://space.newscientist.com/article/mg19826624.700-almighty-smash-left-record-crater-on-mars.html?DCMP=ILC-hmts&nsref=news3_head_mg19826624.700
2. http://space.newscientist.com/article/mg19826624.700-almighty-smash-left-record-crater-on-mars.html?DCMP=ILC-hmts&nsref=news3_head_mg19826624.700

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