A shell of icy objects at the edge of the solar system known as the Oort cloud has a pair of spiral arms that resemble a miniature galaxy, new research suggests.

A rare full seven-planet alignment will be visible in the early night sky between Feb. 22 and 28. We have the tips you need ...

The mysterious Oort cloud is the source of many of our solar system's comets, but astronomers still have no idea what it ...

Researchers claim that there could be at least 1 million interstellar objects hiding in the Oort Cloud at the edge of our ...

But in the grand scheme of the solar system, Earth's Moon isn't as big as you might think. Oberon is Uranus’s second-largest ...