NASA's latest lunar mission, Gravity Recovery And Interior Laboratory (GRAIL), has had the two spacecraft go their separate ways by each executing engine burns to start distancing themselves from one another. GRAIL A will enter lunar orbit on New Year's Eve with GRAIL B following the next day. Science operations will start thereafter.
Read More About It: http://www.jpl.nasa.gov/news/news.cfm?release=2011-314
Sky Guy in VA
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