Move over, Saturn—rings aren't just for giant planets anymore.

Saturn has rings, of course, and so do the other gas giants of our solar system—Jupiter, Uranus, and Neptune—albeit wispier ones than Saturn's. But until now it seemed that only giant planets had the gravity to hold on to the billions of bits of orbiting ice and dust that make up a ring. In a paper published today in Nature, astronomers report the discovery of two icy rings around a small object named Chariklo that orbits between Saturn and Uranus.