. "NASAJPL"@en . "Gravity Recovery and Interior Laboratory"@en . "2011-09-10"^^ . . "Moon \u2013 Oceanus Procellarum"@en . "PIA18822-LunarGrailMission-OceanusProcellarum-Rifts-Overall-20141001.jpg"@en . . "2011-09-09"^^ . . . . "614"^^ . . . "Space Shuttle Grail (disambiguation) The Gravity Recovery and Interior Laboratory (GRAIL) was an American lunar science mission in NASA's Discovery Program which used high-quality gravitational field mapping of the Moon to determine its interior structure. The two small spacecraft GRAIL A (Ebb) and GRAIL B (Flow) were launched on 10 September 2011 aboard a single launch vehicle: the most-powerful configuration of a Delta II, the 7920H-10. GRAIL A separated from the rocket about nine minutes after launch, GRAIL B followed about eight minutes later. They arrived at their orbits around the Moon 25 hours apart. The first probe entered orbit on 31 December 2011 and the second followed on 1 January 2012. The two spacecraft impacted the Lunar surface on December 17, 2012."@en . "Ebb and Flow's Final Moments.jpg"@en . "228"^^ . "905"^^ . . . "rocket propulsion"@en . "center"@en . "2011-09-10"^^ . "Gravity Recovery and Interior Laboratory"@en . "14"^^ . "Delta II 7920H-10 configuration"@en . "A weather balloon was released minutes before the decision point to take the latest readings of upper level winds and Air Force weather reconnaissance aircraft were aloft beginning at 7 am."@en . "2011-09-10"^^ . . "high level winds"@en . "300"^^ . . "GRAIL's Final Resting Spot.jpg"@en . "Space Shuttle Grail (disambiguation) The Gravity Recovery and Interior Laboratory (GRAIL) was an American lunar science mission in NASA's Discovery Program which used high-quality gravitational field mapping of the Moon to determine its interior structure. The two small spacecraft GRAIL A (Ebb) and GRAIL B (Flow) were launched on 10 September 2011 aboard a single launch vehicle: the most-powerful configuration of a Delta II, the 7920H-10. GRAIL A separated from the rocket about nine minutes after launch, GRAIL B followed about eight minutes later. They arrived at their orbits around the Moon 25 hours apart. The first probe entered orbit on 31 December 2011 and the second followed on 1 January 2012. The two spacecraft impacted the Lunar surface on December 17, 2012."@en . . "Ancient rift valleys \u2013 context."@en . . "abandoned"@en . ""@en . . . "Range was reconfigured for omni antennae instead of tracked ones to support 99 degree azimuth."@en . "horizontal"@en . "Ancient rift valleys \u2013 closeup ."@en . "1546"^^ . . "2011"^^ . "1500"^^ . . "-"@en . "PIA18821-LunarGrailMission-OceanusProcellarum-Rifts-Closeup-20141001.jpg"@en . "Success"@en . "GRAIL's final resting spot."@en . . . "2011-09-08"^^ . "600"^^ . "60.0"^^ . "GRAIL Impacts the Moon.ogv"@en . . . "GRAIL mission logo"@en . . "LRO flies over the north pole of the Moon, where it has a very good view of the GRAIL impact. The second part of this video is the view from LRO through LAMP's slit, showing the impact and the resulting plume."@en . "scrubbed"@en . "150"^^ . . "Ancient rift valleys \u2013 rectangular structure ."@en . "This animation shows the last three orbits of the spacecraft, with views of the impact site. The impact occurs on the night side of a waxing crescent Moon, so the view shifts from a natural color Moon to a false-color elevation map."@en . "An issue with the rocket's propulsion system was detected while the Delta 2 rocket was drained of fuel."@en . . . . "1500"^^ . "2011-12-31"^^ . . . . "40.0"^^ . "Artist's interpretation of the GRAIL tandem spacecraft above the lunar surface"@en . . . "left"@en . "Ebb and Flow's final moments."@en . . "LAMP Observes GRAIL Impact.ogg"@en . "Massachusetts Institute of Technology"@en . . "2011-09-08"^^ . .