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NASA's twin Gravity Recovery and Interior Laboratory (GRAIL) lunar spacecraft were attached on Aug. 10, 2011, to the spacecraft adapter ring in their launch configuration in Astrotech Space Operation's payload processing facility in Titusville, Fla. Preparations are under way to transport the lunar probes to the launch pad.
GRAIL will fly in tandem orbits around the moon for several months to measure its gravity field. GRAIL's primary science objectives are to determine the structure of the lunar interior, from crust to core, and to advance understanding of the thermal evolution of the moon.
Launch aboard a United Launch Alliance Delta II rocket from Space Launch Complex 17B at the Cape Canaveral Air Force Station is scheduled for Sept. 8.
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