Scientists pushed photons across the universe to test the speed of light—and found Einstein’s cosmic speed limit still holds firm.

The universe comes with a built‑in speed cap, a hard limit that shapes everything from how stars shine to how cause and ...

Light does a lot of work in the modern world, enabling all types of information technology, from TVs to satellites to fiber-optic cables that carry the internet across oceans. Stanford physicists ...

Physicists from Trinity College Dublin believe new insights into the behavior of light may offer a new means of solving one of science's oldest challenges—how to turn heat into useful energy. Their ...