End of Mission: GRAIL Spacecraft Impact a Mountain on the Moon

The planned path of the GRAIL spacecrafts’ final orbit. Credit: NASA “So long, Ebb and Flow, and we thank you,” said GRAIL project manager David Lehman of NASA’s Jet Propulsion Laboratory after the twin GRAIL spacecraft completed a planned formation-flying double impact into the southern face of 2.5-kilometer- (1.5-mile-) tall mountain on a crater rim [...]