The mind-bending concept of time dilation results from a seemingly harmless assumption—that the speed of light is the same ...

Instead of the big bang, some physicists have suggested that our universe may have come from a big bounce following another ...

Instead of the big bang, some physicists have suggested that our universe may have come from a big bounce following another ...

General relativity and gravity articles from across Nature Portfolio General relativity describes gravitation in a geometrical framework generalizing special relativity and classical mechanics.