SPACE PHOTOS THIS WEEK: Lightning, Star Twins, More

 SPACE PHOTOS THIS WEEK: Lightning, Star Twins, More
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July 14, 2009--So long, and thanks for all the pictures.

A series of recently released images shows Mercury receding as the MESSENGER probe speeds away after completing its second flyby of the innermost planet in October 2008. MESSENGER will return for a third flyby in September 2009 and will become the first craft to settle into orbit around Mercury in March 2011.
— Image courtesy NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington
 
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