Decades in the making, NASA's X-ray timelapse shows a stellar explosion expanding into space at up to 2% the speed of light.

Which way is ‘down’ has a different answer depending on where you are on Earth, in the solar system, in our galaxy and beyond ...

Einstein’s claim that the speed of light is constant has survived more than a century of scrutiny—but scientists are still ...

In the vast calm of the solar system, planetary orbits often appear orderly, stable, and insulated from the broader mechanics ...

A small but incredibly fast unwanted guest is about to swing past Earth at the speed of light. Yeah, this is the tiniest ...

A new study reveals that tiny fragments of Earth's atmosphere are transported to and absorbed by the moon via gusts of solar ...

Both NASA’s James Webb Space Telescope and Chandra X-ray Observatory caught these two galaxies in a close embrace.

Scientists have discovered a “record-breaking” asteroid that is nearly the size of eight football fields. The object, known ...