White dwarfs are the burned-out cores of stars like our sun. Astronomers have discovered a pair of white dwarfs spiraling into one another at breakneck speeds. Today, these white dwarfs are so near they make a complete orbit in just 13 minutes, but they are gradually slipping closer together. About 900,000 years from now — a blink of an eye in astronomical time — they will merge and possibly explode as a supernova.