Black holes, time travel and E= mc^2.They were ideas that, at the time, physics did not have answers for. Years later, in 1915, Einstein presented his General Theory of Relativity. It's about ...

This principle led Einstein to consider incorporating gravity into the framework of his special theory of relativity, culminating in his General Theory of Relativity.

A century ago Albert Einstein unveiled a theory that would change the world — general relativity. Here are five things that need general relativity to work, and may help you manipulate that mind ...

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.

In the most comprehensive test of general relativity near the monstrous black hole at the center of our galaxy, researchers report that Einstein's theory of general relativity holds up, at ...