Jupiter is already the biggest planet by far in our solar system, but new research suggests it was somehow once even larger than it is now. Twice as large, in fact. To put that into context, those ...

Launched in 2006, the probe was the first to get an up-close look at Pluto, a resident of the Kuiper Belt, and serves as astronomers' eyes at the edge of the solar system.

An accidental discovery might change how we think about one of the most mysterious structures in our solar system. The Oort Cloud, a large expanse of icy bodies revolving around the sun at a ...