This Web Seminar took place on December 8, 2009 from 6:30 p.m. to 8:00 p.m. Eastern Time. Presenting was Dr. James Lochner of the Universities Space Research Association and NASA/Goddard Space Flight Center. Dr. Lochner traced some of the questions scientists have had about the universe, and described the tools they used to answer those questions. For more information about this web seminar, its presenter(s), read what participants said about it, and to see and download its PowerPoint slides go here.