Maria Zuber of the Massachusetts Institute of Technology is GRAIL's principal investigator. NASA's Jet Propulsion Laboratory manages the project. As of August 5, 2011, the program has cost US$496 million. At launch the spacecraft were named GRAIL A and GRAIL B and a contest was opened to school children to select names. Nearly 900 classrooms from 45 states, Puerto Rico and the District of Columbia, participated in the contest. The winning names, Ebb and Flow, were suggested by 4th grade students at Emily Dickinson Elementary School in Bozeman, Montana.Each spacecraft transmitted and received telemetry from the other spacecraft and Earth-based facilities. By measuring the change in distance between the two spacecraft, the gravity field and geological structure of the Moon Lab was able to. By measuring the change in the distance between the two spacecraft, the gravity field and geological structure of the Moon Lab was able to. By measuring the change in the distance between the two spacecraft, the gravity field and geological structure of the Moon were obtained.
Ilé Iṣẹ́ Ìwádìí Tó Ń Ṣiṣẹ́ Ọkọ̀ Òfuurufú