For centuries, we believed gravity was a force pulling objects downward. Drop an apple, and gravity does the rest,simple, right? But Albert Einstein shattered this classical view with his Equivalence ...

NASA had just unveiled a time-lapse of space. To create the video, the agency used one of the most powerful telescopes in ...

It seems obvious, then, that, cosmically speaking, everything spins—but this basic fact becomes downright bizarre in the head ...

In fact, only three factors can be used to define a black hole: its mass, its angular momentum and its electric charge. In ...