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Science 8 December 2006:
Vol. 314. no. 5805, p. 1512
DOI: 10.1126/science.314.5805.1512b
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This Week in Science

The thin martian atmosphere does little to protect its surface from bombardment by even small objects from space. Malin et al. (p. 1573; see the news stories by Kerr) have found new impact craters that pockmark the surface of Mars through differencing images from Mars Global Surveyor taken 7 years apart. The impact cratering rate they measured is comparable with that seen for the Moon. Also, they spottey measured is comparable with that seen for the Moon. Also, they spotted recent changes in the walls of two craters that they interpret as evidence for recent trickles of liquid water.




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