Mercury's vast Caloris basin, 1,550 kilometers in diameter, is visible as a large circular orange feature at the center of this false-color picture. The region will be studied extensively by NASA's MESSENGER spacecraft, which on March 17 became the first probe to ever orbit Mercury.
Credit: NASA, Johns Hopkins Univ. Applied Physics Laboratory, Arizona State Univ., Carnegie Institution of Washington. Image reproduced courtesy of Science/AAAS
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