Black hole and Big Bang singularities break our best theory of gravity. A trilogy of theorems hints that physicists must go ...

A new experiment involving a network of entangled atomic clocks could finally help us test how quantum mechanics fits with ...

Einstein's theory of gravity — general relativity — has been very successful for more than a century. However, it has theoretical shortcomings.

A new theory promises to simplify our approach to the universe's earliest moments, but some cosmologists say further ...

A bizarre "cosmic glitch" in the theory of how the gravity of the universe works may have been mended. The strange glitch in Einstein's description of gravity in his theory of general relativity ...

A rift runs deep through the heart of physics. The general theory of relativity, which describes gravity, clashes with quantum physics. In an effort to seal that physics fissure, untold numbers of ...

To square Albert Einstein’s General Theory of Relativity with quantum mechanics requires some currently unknown physics, and that’s led some scientists to question if Einstein’s theory could ...

Neatly packed in his General Theory of Relativity, Albert Einstein and his world-changing theory has accurately predicted many of the cosmological phenomena we’ve glimpsed in the century since ...

In 1916, Einstein announced his holy grail theory of general relativity. The condensed version Basically, Einstein realized that space is much more than the "space" we live in and that time ...

Opinion Decades later, string theory continues its march toward Einstein’s dream. Why we must keep investigating physics’ most tantalizing theory — even without experimental results.

Einstein’s theory of general relativity suggests that our universe originated in a Big Bang. But black holes, and their gravitational forces, challenge the limits of Einstein’s work.