Despite explaining astronomical phenomena far better, general relativity became deeply unfashionable, as it failed to explain what happens deep inside the atom. Einstein’s big idea was the ...

it’s actually by far the weakest of the four known forces of nature – and the only one not explained by quantum theory. Quantum theory and general relativity in fact don’t get along at all.

In our introduction to general relativity, we explain how this theory developed, plus how it explains the motion of the planets, the history and expansion of the universe and the physics of black ...

In 1915, Einstein published his paper on general relativity, a theory of gravitation. While Newton’s gravity explained ...

After thinking about the problems for 10 years, he published the general theory of relativity. In it, he suggested that gravity is not a force, as Newton had believed, but the result of a ...

General relativity describes gravitation in a geometrical ... a phenomenon that is difficult to explain with existing models.

General relativity works well for large-scale objects ... For instance, it might explain why black holes don’t collapse, what ...

A team of physicists affiliated with multiple institutions in China has measured a pulse of light in 37 dimensions. In their paper published in Science Advances, the group explains that their ...

That wasn't just wifely pride. Years before Hubble detected cosmic expansion, Einstein had fashioned a theory, general relativity, that could explain it. In studies of the cosmos, it all goes back ...

When we observe a distant galaxy with our telescope, its light may encounter another galaxy on its way to us. The foreground galaxy acts like a magnifying lens, bending the travelling light rays due ...