©1998 WGBH Educational Foundation. All Rights Reserved.

Adapted from A Science Odyssey: "Mysteries of the Universe". A WGBH Science Unit Production in association with La Cinquiéme. Footage and Photographs courtesy of American Institute of Physics, Corbis, Niels Bohr Institute, Taylor and Francis, University of Cambridge, Cavendish Laboratory, WETA and Zentralbibliothek Wien.