Our Solar System Has a New Visitor: Interstellar Comet Could Be Nearly As Old as the Galaxy Itself

Can you name all the planets in order in the solar system? Try our new quiz to find out!

Astronomers find bizarre 'Cosmic Grapes' galaxy in the early universe. Here's why that's a big deal (photo)

'Ice cube' clouds discovered at the galaxy's center shouldn't exist — and they hint at a recent black hole explosion