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Mercury Craters Look Like Cookie Monster in NASA Photo

Craters photographed by MESSENGER spacecraft may appear to resemble a familiar television character, a favorite of children. Image acquired August 29, 2012.

NASA spacecraft maps planet Mercury

March 1, 2013

The closest planet to the sun hasn't received as much scientific attention as some of its more flashy solar system neighbors, such as Mars, but NASA's Messenger spacecraft is helping to close the gap. The probe has been in orbit around Mercury since March 2011, and its team announced Feb. 28 that the spacecraft had finished mapping the planet's surface.