Two landmark quantum experiments have sharpened one of the oldest arguments in modern physics, and the verdict is not kind to ...

A photon was apparently detected in two places at once in a twist on the classic double-slit experiment, but many physicists ...

Scientists in China have performed an experiment first proposed by Albert Einstein almost a century ago when he sought to ...

Einstein’s claim that the speed of light is constant has survived more than a century of scrutiny—but scientists are still ...

Quantum theory and Einstein's theory of general relativity are two of the greatest successes in modern physics. Each works ...

An analysis of several experiments aimed at detecting the mysterious neutrino has identified a hint of a crack in the ...

A single atom as a movable slit: Researchers realize Einstein's thought experiment in original form, observing ...

"Dark photon" theory says light's interference patterns may emerge from quantum particles, not waves, upending centuries of physics.

"Dark photon" theory says light's interference patterns may emerge from quantum particles, not waves, upending centuries of physics.

Nearly a century after Albert Einstein and Niels Bohr turned a technical disagreement into a philosophical duel, a new ...

Quantum mechanics is weird. When you think you have reached the bottom of its weirdness, you always discover a new ...

The theorized unseen structure of spacetime could also explain of the outstanding questions about the accelerating expansion ...