GRAIL-A and -B Are In Lunar Orbit

First Of NASA'S Two Grail Spacecraft Enters Orbit Around Moon

"The first of two NASA spacecraft to study the moon in unprecedented detail has entered lunar orbit. NASA's Gravity Recovery And Interior Laboratory (GRAIL)-A spacecraft successfully completed its planned main engine burn at 2 p.m. PST (5 p.m. EST) today. As of 3 p.m. PST (6 p.m. EST), GRAIL-A is in a 56-mile (90-kilometer) by 5,197-mile (8,363-kilometer) orbit around the moon that takes approximately 11.5 hours to complete."

NASA's Twin Grail Spacecraft Reunite in Lunar Orbit

"The second of NASA's two Gravity Recovery And Interior Laboratory (GRAIL) spacecraft has successfully completed its planned main engine burn and is now in lunar orbit. Working together, GRAIL-A and GRAIL-B will study the moon as never before."