Few ideas in modern science have reshaped our understanding of reality more profoundly than space-time—the interwoven fabric of space and time at the heart of Albert Einstein's theory of relativity.

Albert Einstein's famous theory of relativity has been borne out in the real world, measured in eclipses, distorted galaxies and even the universe's structure. (Image credit: NASA) ...

No one knows what happens inside a black hole, but Einstein’s theory of general relativity still explains the phenomena occurring just outside.

What is Einstein’s general theory of relativity? 25 Nov 2015 It was 100 years ago this month that Einstein first presented his general theory of relativity – a work that would transform our ...

What do most people misunderstand about Einstein's Theory of Relativity? This question was originally answered on Quora by Paul Mainwood.

This column on general relativity and space-time by physicist Sean Carroll was published on Nov. 23, two days before the 100th anniversary of Einstein’s theory of general relativity.

At the age of 16, Albert Einstein famously envisioned running alongside a beam of light, which resulted in his Special Theory of Relativity: time slows down. “To raise new questions, new ...

Einstein's theory, one of the greatest scientific breakthroughs of the 20th century, revolutionized conceptions of time, gravity, the origins of the universe and its very shape.

Many theories are rock-solid: Scientists have just as much confidence in the theories of relativity, quantum mechanics, ...

Albert Einstein’s theory of general relativity has been remarkably successful in describing the gravity of stars and planets, but it doesn’t seem to apply perfectly on all scales.