Researchers say Einstein's ideas hold up in a new kind of test. "This is a brand new way to test general relativity using supermassive black holes."

Quantum cosmology takes us "beyond the continuum described by general relativity where Einstein's physics breaks down—for example beyond the Big Bang."

So little is known about black holes and the image hints at a path to a higher-resolution image and more and better data.

A historian explains how war and politics almost overshadowed Albert Einstein's work and why Veterans Day should remind us of the threat of nationalism.

If wormholes, bridges between regions in spacetime, are more than just a sci-fi fantasy, researchers may have a way to detect them.

A new book tells the story of astronomers racing to prove Einstein's theory of general relativity correct with a solar eclipse.

A new method lets researchers detect tones coming from a black hole, which also confirms Einstein's theory of general relativity.