The backs for these cards came from the U.S. National Aeronautics and Space Administration. The original images can be found at: http://antwrp.gsfc.nasa.gov/apod/archivepix.html along with a lot more just like 'em. The penguins are by "The PAPA" and can be found at: http://biancaneve.ing.unifi.it/~papalini/ and there's a lot more of those too. Copyright (C) 1999 T. Kirk This card set is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.