Mars Got Slammed by a Big One
June 25, 2008 -- About four billion years ago, scientists believe Earth got smacked so hard by an asteroid or comet that a piece broke off to form the moon. Apparently, things weren't much better on Mars.
Three related studies appearing in this week's edition of the journal Nature provide evidence that Mars bears the biggest scar in the solar system -- an oval-shaped, 6,200-mile long impact crater that shattered half the planet's crust, left its southern hemisphere 2.5 miles taller than the north and possibly created the largest known string of volcanoes.
From Discovery News
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