Using Einstein's theory of general relativity, physicists found that clocks on the moon would run 56 microseconds faster than clocks on Earth. That finding will help future lunar missions navigate.

A total lunar eclipse will be visible across most of the United States in the early hours of Tuesday. A total lunar eclipse occurs when Earth moves between the sun and the moon. It creates a dark red ...

Early Tuesday morning, March 3, a total eclipse of the Moon will be visible from throughout the U.S. (and North and America). In a lunar eclipse, the Moon and the Sun are exactly opposite each other ...