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 ...

Future gravitational wave observations will allow us to test more exotic scientific theories, and maybe even probe the ...

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

Researchers at Hiroshima University have developed a realistic, highly sensitive method to detect the Unruh effect—a ...

The researchers employed a specific theoretical framework related to string theory to calculate the changes in these vibrations as black holes approach their 'limits.' The results indicate that as ...

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 ...

Black holes may be the fiercest objects in the universe, yet we still know very little about them. It has only been a decade ...