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In looking at the Martian hemispheric dichotomy (significant differences in the Martian crust over a large radius) simulations suggest that Mars was hit by something like a 1000 to 1700 mile wide asteroid about 4 billion years ago.
http://www.sciam.com/article.cfm?id=giant-asteroid-flattened
Possibly not all that long after the Earth was acquiring the moon.
It was a rough neighborhood in those days.
http://www.sciam.com/article.cfm?id=giant-asteroid-flattened
Possibly not all that long after the Earth was acquiring the moon.
It was a rough neighborhood in those days.