The constancy of the speed of light is a pillar of modern physics, but questions persist about its absolute universality.

Newtonian physics postulates gravity's action as instantaneous, implying infinite speed, contrasting with Einstein's relativity. Einstein's general relativity predicts that gravitational interactions ...

COLUMBIA, Mo. – Scientists have attempted to disprove Albert Einstein’s theory of general relativity for the better part of a century. After testing and confirming Einstein’s prediction in 2002 that ...

In 1887, one of the most important experiments in the history of physics took place. American scientists Michelson and Morley failed to measure the speed of Earth by comparing the speed of light in ...

The speed of light has been one of science’s most trusted markers of stability. For more than a century, the idea that light ...

Gravity is the force of action between two objects. It’s called a natural force because it acts at a distance rather than needing to be in contact. Gravity is the force that holds us down on Earth and ...

Scientists have attempted to disprove Albert Einstein's theory of general relativity for the better part of a century. After testing and confirming Einstein's prediction in 2002 that gravity moves at ...