Because the Earth is doing the work of increasing the Moon's momentum, the Earth's rotation slows down in turn, as its momentum goes to the Moon. To put it another way, as the Moon's orbital momentum ...
The Moon is getting 1½ inches (3.8 centimeters) farther away from the Earth every year. Scientists measure the distance to the Moon by bouncing lasers off mirrors placed there by space probes and ...
On December 14, as NASA's GRAIL mission came to a close, the mission's Ebb spacecraft flew above the northern hemisphere of the far side of the moon. The little spaceship -- a vehicle about the size ...
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