"This work is a step toward understanding how quantum mechanics and gravity work together, a major unsolved problem in ...

At cosmological scales, Albert Einstein’s theory of general relativity has given scientists an immensely accurate blueprint ...

Since the beginning of the 20th century, Einstein's theory of general relativity has been the best description we have of how gravity works. However, right around when Einstein came up with ...

For decades, physicists have faced one of science’s greatest puzzles: merging quantum mechanics, which describes tiny ...

General relativity is distinguished from other metric theories of gravitation by its use of the Einstein field equations to relate spacetime content and spacetime curvature.

New impressions A visualization of a curved space–time “sea” from the general-relativity simulations carried out by the authors. (Courtesy: James Mertens) From the Genesis story in the Old Testament ...

One of the most impressive things about Einstein's 1915 theory of gravity, general relativity, is just how many incredible cosmic objects its central equations have predicted.

One might wonder why, exactly, a theory of gravity is called a “general theory of relativity.” Well, Einstein began to use this title before the theory was complete.

General relativity provided more surprises than just gravity waves, for instance. Black holes, gravitational lensing and even, in a way, the expansion of the universe emerged from Einstein’s ...

If general relativity matched LIGO's measurements when pi was not close to its true figure, that would be a sign that the theory was only half-baked.