One of the researchers who helped demote Pluto believes he may have found a new ninth world, much bigger and way farther out.
A surprising find has researchers thinking that they may have discovered a "Solar System 2.0."
Astronomers have found the very first quintuple star system consisting of two sets of eclipsing binary stars and one solo star.
Hundreds of galaxies lurking near the Milky Way could help explain an anomaly known as the Great Attractor.
By using the world's preeminent telescopes, astronomers peer behind a curtain of dust to find a giant star-making factory known as "Sparky."
NASA releases a video guide to a solar system phenomenon that hasn't happened in more than 10 years.
Astronomers detail their discovery of a record-setting supernova that defies easy explanation.
It could be the most isolated planet in any solar system, and CNET's Eric Mack thinks he can relate.
A giant star in the Canis Majoris constellation isn't acting like itself, and scientists are doing their best to figure out why.
An international team of astronomers has witnessed an "extremely rare" event: a black hole eating a star then ejecting a near light-speed flare.