About 4.6 billion years ago, our corner of space was basically just a boring cloud of gas and dust floating around, and then something amazing happened that turned this mess into the planets, moons, ...

Add Yahoo as a preferred source to see more of our stories on Google. The Oort Cloud, an expanse of icy bodies in the far reaches of our solar system, is shown here in a scene from "Encounters in the ...

A newly discovered object speeding through our solar system is sparking excitement among astronomers because it’s not from around here. Believed to be a comet, the object is only the third celestial ...