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Old Oct 5 2009, 07:24 PM   #9
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Join Date: Nov 2004
Location: Maryland, USA
Gender: F
Fan of: Pern!
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Default Re: New Messenger images of Mercury

The vast majority of the bombardment was early in the history of the planets right, while they swept up all the debris from the birth of the solar system, right?

Since then, plate tectonics and sediment deposition (and subsequent sedimentary rock formation) has wiped the crust clean of that early bombardment, and only the periodic later impacts are nicely visible.
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