NASA Reference and Library Materials Menu (listed alphabetically) Exploring the Moon Slide Set (PDF file - 2 MB) Our Very Own Star: The Sun (PDF), a book for grades K-4. Also, the Spanish version - Nuestra Propia Estrella: el Sol (PDF) is available. Welcome to the Planets The WWW portion of NASA's Planetary Data System Educational CD-ROM online. This section contains a more in-depth description of each planet with many pictures of each. Last modified by Nathan Smith - 03 October 2002