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Marvelous Mercury -- In Color

To the human eye, tiny Mercury, the innermost planet of the solar system, may look like Earth’s moon, but appearances can be deceiving.

February 22, 2013
2:08 PM EST
The planet Mercury, as mapped by the NASA MESSENGER probe, in color. The color variation signifies the rich, varying composition of rocks on the small world's surface (click to see the high resolution version). | NASA