Mathematical quirks of our universe have led some cosmologists wonder whether the cosmos was actually born in a black hole.

The speed of light, c, is not just a very large number. In modern physics it is a structural constant: the conversion factor ...

From early experiments with lanterns to Einstein’s revelations about space and time, the speed of light has proven to be far ...

The first-ever detection of gravitational waves was made 10 years ago today (Sept. 14). In celebration, Space.com takes you ...

Is time something that flows — or just an illusion? Exploring space-time as either a fixed “block universe” or a dynamic fabric reveals deeper mysteries about existence, change, and the very nature of ...

Ten years after scientists first detected gravitational waves emerging from two colliding black holes, the LIGO-Virgo-KAGRA ...

A recently discovered black hole merger is proving correct theoretical predictions made by Albert Einstein and Stephen ...

Einstein’s theory of special relativity tells us that for a moving object, time passes more slowly than for a stationary ...

In a landmark achievement, astronomers have noticed light bending in an unexpected manner, one that doesn’t align with the predictions made by Albert Einstein’s theory of general relativity. This ...

Astronomers detected in unprecedented detail a collision between two black holes. Their observations confirm predictions made ...

Ten years ago, scientists heard the universe rumble for the first time. That first discovery of gravitational waves proved a ...