Narrator: This is Science Today. Using the Hubble Space Telescope, an international team of astronomers may have solved a longstanding galactic mystery. Ivan King, a professor emeritus of astronomy at the University of California, Berkeley, says astronomers have long puzzled over the center of the Andromeda Galaxy - the Milky Way's nearest neighbor.
King: Most galaxies have one small, bright nucleus at their center, this one has two and the second nucleus has always been something of a mystery.
Narrator: But by using the Hubble's Faint Object Camera, which King helped design, astronomers had the clearest view yet of Andromeda's center. Their findings support a previous theory that stars are orbiting the galaxy's central black hole in a lopsided path and are piling up - like a cosmic traffic jam - at a section farthest away from the black hole. King says why this may happen is still a mystery.
King: But I've never believed that at any given moment you have to have an answer for everything. There are always going to be mysteries in the Universe!
Narrator: For Science Today, I'm Larissa Branin.