December 18, 2012 02:27 am | Updated November 17, 2021 04:32 am IST - Washington
FILE - This undated artist file rendering provided by NASA on Dec. 21, 2011, shows the twin Grail spacecraft mapping the lunar gravity field. Launched from Cape Canaveral on Sept. 10, 2011, the spacecraft began collecting data in March, 2012. After nearly a year circling the moon, NASA's Ebb and Flow spacecraft will meet their demise when they are scheduled to crash - on purpose - into a lunar mountain Monday, Dec. 17, 2012, ending a successful mission. (AP Photo/NASA, Jet Propulsion Laboratory, File)
Ebb and Flow, NASA’s twin lunar-orbiting spacecraft, that provided valuable information about structure and composition of the Moon, are scheduled to hurtle into a crater on the lunar surface at 1.7 km per second 20 seconds apart, on Monday night, ending a 15-month gravity-mapping mission.
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