Time travel has shifted from pure fantasy to a serious, if highly constrained, topic in modern physics. The equations that ...

The big thinkers at Aperture explain relativity and how it warps the fabric of spacetime. Tom Cruise visited 'Star Wars: ...

Einstein's theory of general relativity has passed its toughest test with flying colors, a new study reports. General relativity, which Einstein proposed in 1916, holds that gravity is a consequence ...

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.