GRAIL (Gravity Recovery and Interior Laboratory)
GRAIL is part of NASA's Discovery Program. the two spacecraft were launched on September 10, 2011, by a Delta II rocket from Cape Canaveral Air Force Station. They arrived at their orbits around the Moon 25 hours apart. The first probe entered orbit on December 31,2011 and the second a day later. The two spacecraft impacted the lunar surface on December 17, 2012.
Related category SATELLITES AND SPACE PROBES
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