Time is often treated as constant, but Einstein showed that it isn’t. Speed and gravity both affect how fast time moves, and this has been proven through real experiments and satellite technology.

One of the general theories of relativity, ' time dilation, ' is a phenomenon in which when the gravity applied to two points is different, the time at the two points travels differently. When we say ...

The researchers used measurements from the Moon's gravity to program a software package that can measure lunar time.