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 ...

The coldest and densest molecular gas clouds in the interstellar medium can have temperatures of 10 K (-505 °F/-263 °C), ...

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 ...

At half the size of Earth and one-tenth its mass, Mars is a featherweight as far as planets go. Yet new research reveals the ...

New satellite records capture how polar ice sheets slide toward the sea, helping scientists better understand ice loss and ...

T he Hubble Space Telescope (HST) has been pivotal to progress in the last three decades of astronomy and cosmology.

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