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

Einstein’s Theory of General Relativity is currently our best approximation of how the universe ticks. But there are holes.

Now, two unrelated-but-similar experiments confirm that, in a double-slit experiment, detection of a photon’s path (its ...

Wormholes are often imagined as tunnels through space or time—shortcuts across the universe. But this image rests on a ...

Einstein’s claim that the speed of light is constant has survived more than a century of scrutiny—but scientists are still ...

Because the moon has less gravity than Earth does, time passes slightly differently there. This effect was first predicted by ...

Do you know what connects Edwin Hubble’s theory for an expanding universe and Albert Einstein’s cosmological constant? The ...

The man was the smartest person on the planet. On his birthday, why not celebrate by quoting him and sounding brilliant?