Dr. Robert A.E. Fosbury, of the European Space Agency's Space Telescope-European Coordinating Facility in Germany, tells how the Lynx arc discovery began. "One Friday afternoon a colleague walked in waving a sheet of paper vigorously. The plot showed a spectrum of a mysterious arc in the Lynx cluster. It had already been passed around to the members of the cluster collaboration, but nobody was able to recognize the type of object."