For more than a century, gravity has been the stubborn outlier in physics, perfectly described on cosmic scales yet refusing to mesh with the quantum rules that govern everything else. A growing camp ...

Physicists have demonstrated with unprecedented accuracy that the speed of light remains constant. In 1887, a landmark physics experiment was carried out by American researchers Michelson and Morley.

Physicists have chased a unified description of nature for more than a century, yet quantum theory and gravity have ...

A new study suggests that gravity could quantum-entangle particles even if it remained classical.

"GW250114 is the loudest gravitational wave event we have detected to date; it was like a whisper becoming a shout." The Laser Interferometer Gravitational-Wave Observatory (LIGO) is celebrating 10 ...

Albert Einstein's theory of gravity, general relativity, may not be the best recipe to describe black holes. New research suggests future images of black holes could be precise enough to allow ...