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8 mysterious images of Mars

By: Katherine Butler on Oct. 11, 2010, 11:55 a.m.
rocks on red soil

Photo: NASA/JPL-CalTech/University of Arizona/Texas A&M

7 of 9

Morning frost

This false-color photo was taken by the Mars Phoenix Lander on Aug. 14, 2008. Soon after the photo was taken, the frost disappeared from the heat of the rising sun. Mars has a gravitational pull that is about 38 percent that of Earth's, though Earth is about 10 times more massive than Mars. There is no evidence that the planet has magnetic poles now, but there are indications that they once existed. (And for more interesting comparisons, check out this NASA story.)