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Grail-B

A Delta II heavy launch vehicle lifts off on September 10, 2011 with NASA's GRAIL mission to the moon from launch pad 17B at Cape Canaveral, Florida. (credit: BRUCE WEAVER/AFP/Getty Images)

Moon Countdown: NASA Probe Enters Lunar Orbit

A NASA spacecraft has successfully slipped into orbit around the moon.

12/31/2011

(credit: Bruce Weaver/AFP/Getty Images)

NASA Says Its Probes Will Arrive At Moon Over New Year’s Weekend

NASA says its twin spacecraft are on course to arrive back-to-back at the moon after a 3 1/2-month journey.

12/28/2011