The second of NASA's two Gravity Recovery And Interior Laboratory (GRAIL) spacecraft has successfully completed its planned main engine burn and is now in lunar orbit. Working together, GRAIL-A and GRAIL-B will study the moon as never before.
http://www.33rdsquare.com/2011/12/nasas-grail-mission-24-hours-away-from.html
More information about GRAIL
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