PASADENA, Calif., Dec. 29 (UPI) -- NASA says twin spacecraft sent to study the moon from crust to core are preparing for New Year's Eve and New Year's Day main-engine burns to enter lunar orbit.
Named the Gravity Recovery And Interior Laboratory, the spacecraft are scheduled to enter their orbits beginning at 4:21 p.m. EST for GRAIL-A Dec. 31, and 5:05 p.m. EST for GRAIL-B the next day, NASA said in a release Thursday.