Pluto was believed to be the only body beyond Neptune with an atmosphere. Now, a new discovery in our solar system is ...

The finding comes with significant new suggestions about the solar system ...

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 ...

Worlds this small and distant are thought to be too cold and have too little surface gravity to hold onto gases. But the findings suggest that icy, rocky objects in the solar system's outer reaches ar ...

Astronomers have identified a repeating radio signal that is also emitting X-rays, a first-of-its-kind observation that may point to an entirely new class of astronomical objects. The object, named ...

This image provided by NASA shows X-rays from NASA’s Chandra X-ray Observatory (represented in blue) that have been combined with infrared data from NASA’s retired Spitzer Space Telescope (cyan, light ...

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 ...