New observations from NASA's MESSENGER spacecraft reveal about 30 percent of the planet Mercury that has never been seen up close before. A giant crater and evidence of ancient volcanoes are among the findings. The photos show a giant impact crater that spans a length equivalent to the distance between Washington, D.C., and Boston. MESSENGER (MErcury Surface, Space ENvironment, GEochemistry, and Ranging spacecraft) made its second close-approach flyby of Mercury in October 2008. (source: msnbc.msn.com)
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