Add Yahoo as a preferred source to see more of our stories on Google. This image provided by NASA shows X-rays from NASA’s Chandra X-ray Observatory (represented in blue) that have been combined with ...

The first dark comet—a celestial object that looks like an asteroid but moves through space like a comet—was reported less than two years ago. Soon after, another six were found. In a new paper, ...

NASA’s Chandra X-ray Observatory spotted the X-ray emissions by chance last year while focusing on a supernova remnant, or the remains of an exploded star. Wang said it was the first time X-rays had ...

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. Astronomers have ...

Across the observable universe, galaxies appear as luminous islands of stars and gas, anchored by invisible frameworks of dark matter. The prevailing view in cosmology holds that when these frameworks ...

Beyond the reaches of Neptune, the outskirts of our solar system are teeming with thousands of icy celestial bodies like Pluto. For years, it's been an accepted tenet of astronomy that, with the ...

An international team reported Wednesday that this celestial object — perhaps a star, pair of stars or something else entirely — is emitting X-rays around the same time it’s shooting out radio waves.

CAPE CANAVERAL, Fla. (AP) — Astronomers have discovered a strange new object in our Milky Way galaxy. An international team reported Wednesday that this celestial object — perhaps a star, pair of ...