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These craters are old, I mean really old.
Heavily cratered terrain on Mars was created between 4.2 to 3.8 billion years ago during the period of "heavy bombardment" (i.e. impacts of asteroids, proto-planets, and comets). Since then the surface of Mars has not been extensively modified. Surfaces on airless bodies such as Mars that have not been subsequently modified by volcanism are "saturated" in craters.
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Code book, code book
Looking over the code books, since I’ve been reading the Elon Musk biography, I will, of course, be going with the Mars Crater Study!
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