For over a century, quantum mechanics and Einstein’s general relativity have stood as the cornerstones of modern physics, yet ...

On 25 November 1915, Albert Einstein presented his general theory of relativity at the Prussian Academy of Sciences. This theory is still considered to be the most important idea in modern physics.

Emmy Noether showed that fundamental physical laws are just a consequence of simple symmetries. A century later, her insights ...

Albert Einstein's general theory of relativity is one of the towering achievements of 20th-century physics. In our introduction to general relativity, we explain how this theory developed ...

For the first time, a mathematical framework proves that Einstein’s theory of general relativity, which explains the ...

General relativity describes gravitation in a geometrical framework generalizing special relativity and classical mechanics. This term includes theoretical studies of gravity, experimental studies ...

The grandfather paradox is just one of the thorny logical problems that arise with the concept of time travel. But one physicist says he has resolved them.

This NASA/ESA Hubble Space Telescope image reveals a tiny patch of sky in the constellation Hydra. The stars and galaxies depicted here span a mind-bending range of distances. The objects in this ...

A team of physicists affiliated with multiple institutions in China has measured a pulse of light in 37 dimensions. In their ...

The Tetrahedron Constellation Gravitational Wave Observatory would consist of four satellites positioned in space ...