today at ~ 3 pm PDT when NASA's MESSENGER spacecraft whizzes by the first rock from the Sun at a 142 mi (228 km) altitude during its third flyby in order to slow down to enter orbit in March 2011.The image shown above (click to enlarge) is a true-color view (left) and a composite of visual and infrared observations (right) that shows variations of mineral deposits on Mercury.
Image credit: NASA's MESSENGER spacecraft on 6 October 2008; NASA/JHUAPL.
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