There are only a few ideas that are powerful enough to shape our entire picture of the Universe and how it works: gravitation, the laws of motion, electricity and magnetism, quantum mechanics. Yet a ...

It stands among the most famous theories ever created, but the general theory of relativity did not spring into being with a single, astonishing paper like the special theory of relativity in 1905.

Astronomers have finally watched a black hole do something Albert Einstein only described on paper: twist the very fabric of ...

For the first time ever, researchers have watched a star race past the supermassive black hole at the heart of the Milky Way, verifying that its motion showed the effects of general relativity, as ...