Are we alone in the universe? Consider mysterious "extraterrestrial" radio signals. Unexplained gases on other planets.

An astonishing discovery comes from the outer reaches of the Solar System: Pluto and Titan, two very different celestial ...

That sharp, briny smell is not the salt, it is a gas made by life, breathed out by tiny ocean creatures too small to see. For ...

This is the first image of a rare 'minimoon' that loops around the Earth like a dance partner.

The European Space Agency’s Euclid space telescope has discovered 31 of the most ancient quasars ever found – and two of ...

To mark the 250th anniversary of the United States, NASA released a striking new image from the Hubble Space Telescope ...

Chinese mission Tianwen-2 released a new image of an asteroid orbiting Earth, which is sometimes referred to as a “quasi-moon ...

A Wave of Ancient Quasars Discovered from the Dawn of the Universe. VC: W. M. Keck Observatory This artist’s impression shows ...

The exoplanet telescope TESS revealed a distant world using an entirely different detection method than the one it was built ...

Skywatchers are going to want to keep an eye on the sky across the U.S. on Tuesday evening. The moon and Saturn conjunction ...

NASA is preparing for a rescue that sounds more like a stunt than routine mission control: send a robot into orbit, find an ...

The Euclid space telescope has spotted the oldest quasars — the brightest objects in the universe — ever discovered, ...