NASA's 2nd Probe Reaches Lunar Orbit, Joins Twin

The Grail spacecraft ? short for Gravity Recovery and Interior Laboratory ? are on a hunt to learn what's inside the moon by meticulously mapping its lumpy gravity field from orbit.

Source: http://www.npr.org/2012/01/01/144552478/nasas-2nd-probe-en-route-to-moon?ft=1&f=1007

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