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 ...

Among other things, the James Webb Space Telescope is designed to get us closer to finding habitable worlds around faraway ...

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), ...

Scientists discover asteroid spinning once every 1.88 minutes—the fastest rotation ever found for a large space rock. Five ...

2025 MN45 isn't the overall spin-rate record holder. Astronomers have found a number of small asteroids — those just a few ...

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

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

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

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