NASA's GRAIL mission will determine what lies beneath the lunar crust by measuring the moon's gravitational field.<img src="http://feeds.feedburner.com/~r/DiscoveryNews-Top-Stories/~4/R1JCdy2U2eo" height="1" width="1"/>
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NASA's GRAIL mission will determine what lies beneath the lunar crust by measuring the moon's gravitational field.<img src="http://feeds.feedburner.com/~r/DiscoveryNews-Top-Stories/~4/R1JCdy2U2eo" height="1" width="1"/>