NASA's GRAIL spacecraft successfully launched from Cape Canaveral Air Force Station, Fla., at 9:08 EDT (6:08 PDT) on Sept. 10, 2011. As depicted in the artist's concept on the right, the twin spacecraft, GRAIL-A and GRAIL-B will work in tandem to study the lunar interior, from crust to core, and to advance understanding of the thermal evolution of the moon. Image Credit: NASA/JPL-Caltech/Thom Baur, United Launch Alliance