PASADENA, Calif., Dec. 14 (UPI) -- Twin lunar-orbiting spacecraft that have gathered data about the moon's internal structure and composition will be crashed into the lunar surface, NASA says.
Because their low orbit and low fuel levels preclude further scientific operations, the twin Gravity Recovery and Interior Laboratory GRAIL mission probes named Ebb and Flow will make a controlled descent and impact near the moon's north pole about 5:28 EST Monday, the space agency reported.