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 ...

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

Scientists enable excitons to surpass light to transform materials and open new advanced paths to quantum devices.

Add Yahoo as a preferred source to see more of our stories on Google. When you buy through links on our articles, Future and its syndication partners may earn a commission. The Vienna team stitched ...

In the strange corner of modern physics where spacetime itself becomes the engine, the old rule that nothing can outrun light ...

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

Scientists trying to replicate conditions that existed in the first microsecond after the Big Bang have discovered that gold ions ramming each other at nearly the speed of light produce a surprisingly ...

The famous double-slit experiment, which demonstrated that light is both a wave and a particle, has been performed using “slits in time”. The techniques involved present a new way to manipulate light ...