The constancy of the speed of light is a pillar of modern physics, but questions persist about its absolute universality.

Video of a black light experiment designed to show how fast a virus can spread in a restaurant setting is quickly going viral. The video, which was shot in Japan by the public broadcasting ...

Addressing a controversy first raised around 1910, two physicists have performed experiments with the aid of an engineer that validate anew the special theory of relativity’s limitations on the speed ...

A black light experiment depicted in a viral video from Japan's NHK public broadcasting organization shows just how widely and quickly germs can spread, particularly during the COVID-19 era. The video ...

Physicists using near-absolute-zero detectors have reached unprecedented sensitivity in the hunt for light dark matter. A ...

It took a lot of careful and detailed measurement to prove that the speed of light doesn’t change. But it also took one important thought experiment. The de Sitter Effect showed us how stars would ...

Overall Light Attack Acquisition Project Continues Despite Accident. Military.com’s Oriana Pawlyk reports that the innovative U.S. Air Force Light Attack Experiment has been halted following last week ...

The experiment highlights one way the virus could rapidly spread on surfaces, though close contact with an infected person is the most common method of transmission A new video going viral in Japan ...

Can you benefit from light therapy? It depends. Treatments range from nonsensical to possibly useful to those proven to be ...

Is light made of waves, or particles? This fundamental question has dogged scientists for decades, because light seems to be both. However, until now, experiments have revealed light to act either ...

TimesMachine is an exclusive benefit for home delivery and digital subscribers. About the Archive This is a digitized version of an article from The Times’s print archive, before the start of online ...