gravity

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.

The universe may be vast, but researchers have multiple points of evidence that reveal its shape.

A new image using data collected by NASA's James Webb Space Telescope shows off one of the most perfect "Einstein rings" ever captured.

Here's a look at whether Earth is getting closer to or farther from the sun, why that's happening and what effects it might have on our planet.

How one earth (or space) can a person experience microgravity?

Scientists tested seven different predictions, in one of the most ambitious and involved challenges to general relativity ever undertaken — and the theory passed with flying colors.

Here are nine equations that altered the course of history.

Quantum mechanics explains why the electrons can keep spinning indefinitely.

The unusual trio is much more massive and compact than similar systems.

The light they produce wobbles around, making them hard to pin down.