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

For those who watch gravitational waves roll in from the universe, GW250114 is a big one. It's the clearest gravitational ...

A century-old thought experiment on wave–particle duality is brought into the laboratory using a single trapped atom ...

From the fall of an apple to the glow of the farthest known star, gravity quietly choreographs almost everything that happens ...

In an effort to bring together the domains of gravity and quantum theory, Albert Einstein and Nathan Rosen proposed a ...

The Einstein–de Haas effect, which links the spin of electrons to macroscopic rotation, has now been demonstrated in a ...

To understand gravity, Einstein had to rethink space and time as a single connected fabric. He showed that mass bends this fabric, guiding how everything moves. NOVA is available to stream on pbs.org ...

Albert Einstein was well known for his thought experiments involving complex scientific ideas. Often he used real-world examples that helped non-scientists grasp his theories of relativity. He started ...

The faster you move, the stranger time becomes. By imagining how light travels to two people moving at different speeds, Einstein showed that time isn’t absolute. His thought experiment revealed that ...

Einstein liked everything to be deterministic – that is, if you had enough information about a system you could take its current state and work out any specific state in its past or future.