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The LCROSS payload is shown undergoing checkout following its arrival at Northrop Grumman's manufacturing facility in Redondo Beach, Calif.  Built by NASA Ames, the payload consists of nine science instruments, weighs only 27.3 pounds (12.4 kilograms) and was designed to provide multiple complementary measurements.  Eight of LCROSS’ nine sensors are surrounded by a sunshade.  The ninth LCROSS sensor views a perpendicular plane during the final impact and is located to the lower right outside the sunshade.