Why a Mars Rock Hits Earth Every Month

Posted by tourdemars to Meteorites at November 7, 2002 12:00 PM

Every month, on average, a rock from Mars lands on Earth. Most are never found, but those that have been picked up suggest that the theory for how they get here – having been booted from the Red Planet by very large asteroid impacts – is not fully accurate. Now a new computer simulation appears to solve the puzzle by showing that relatively small collisions can do the trick.