© 2006, 2002 WGBH Educational Foundation. All Rights Reserved.
Adapted from NOVA: "Galileo's Battle for the Heavens." A NOVA Production by Green Umbrella, LTD for WGBH/Boston in association with Channel 4. Still images courtesy of History of Science Collections, University of Oklahoma Libraries, Galileo Manuscript, Special Collections Library, University of Michigan, Calvin College Observatory and NASA/JPL-Caltech.