Variously defined as "endless" or "unlimited," infinity creates paradoxes that can truly boggle the mind. As the mathematician Dr. James Grimes explains, "there are different kinds of infinity.

A twisted ring of gas, one that stretches more than 600 light-years across the heart of the Milky Way galaxy, has been discovered by astronomers using a powerful infrared space telescope.

Astronomers discovered a twisted ring of gas that looks like an "infinity symbol", stretching past 600 light-years across the center of the Milky Way galaxy.