Astronomers have discovered icy rocks in the outer solar system that seem to defy the laws of physics, raising questions ...

Astronomers are closing in on one of the most tantalizing possibilities in planetary science, evidence that a previously unknown world may be lurking in the outer reaches of the solar system. The ...

A newly-discovered planet named Enaiposha, GJ 1214 b, is unlike anything found in our own solar system, similar to a ...

It's been 20 years since Pluto was declassified as the ninth planet in our solar system, and many people wish it had never ...

What started as a mysterious red dot in images taken by University of Arizona astronomers has been confirmed as a huge, newly ...

Far beyond the reach of any spacecraft, a distant world glows with heat so intense that rock itself turns to vapor. In that ...