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.

Does dark matter follow the same laws as ordinary matter? The mystery surrounding this invisible and hypothetical component ...

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 ...

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 ...