Oh, but that light still travels at the speed of light, so it takes more time to reach the other mirror. And if the spaceship is moving at a speed of c/2, that would be a lot more time.

But for light itself, which travels at 299,792 kilometers per second, time doesn’t pass at all. From a photon’s point of view, the journey from emission to absorption happens instantly.

Yet until now, one trick up the theorist's sleeve for measuring light's journey – invoking imaginary time – has not been fully understood in practical terms.

These time crystals might help researchers achieve even more refined control over light, opening new avenues for technological advancement. The significance of this experiment extends beyond ...

Physics Light has been made into a fluid that simulates space-time By using light to emulate the structure of space-time, researchers can better understand black holes – and the exotic objects ...

Credit: S. Feldmann (EPFL) EPFL scientists have developed a new technique that lets researchers watch, with unprecedented sensitivity, how materials emit polarized light over time.