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Advance Space - educational resource offering links to organizations, experts, and references. Celestia - downloadable real-time space simulation that lets users experience the universe in three dimensions. Constants and Equations for Space-Related Calculations Destination Space - National Geographic Explorer investigates space travel and exploration. Glossary of Terms - from the NASA Jet Propulsion Laboratory. Inquirer's Guide To The Universe - including space science fact, space science fiction, imaginary planet gallery, space story studios and a space story portfolio. James Oberg - articles, speeches, columns, and more by the spaceflight operations expert and author. Millennium Group, The - about many physical phenomena on earth and in the heavens. New Look at the Universe as a Closed Cosmic Hypersphere Observatorium, The - public information server promoting improved public access to NASA's large repository of earth and space science data, applications and technologies. Slingshot Effect, The - how spacecraft accelerate in planetary flybys by gravity assist.	Space & Flight - Chuck Fiterman's Launch Pad. Space and Flight Mailing List - space exploration, astronomy, and aviation mailing list. Space Calendar - covers space-related activities and anniversaries for the coming year, including links to related home pages. Space Physics at the NSSDC - provides information about their spacecraft and missions. Space Scientists Online - provides new and exciting information from space sciences and collects relevant information from previous space science projects. Space Today Online - comprehensive directory covering space from earth to the edge of the universe. Space, The Final Frontier - space chat, current news and comprehensive links for the US, Russian and European Space Programs. spaceKids.com - news and entertainment site for kids featuring space and science news stories, interactive games, weekly polls, kids' submissions, images, contests, and more. SpaceRef.com - includes space news and briefs, and photos. A reference site that also has a directory of space-related Web sites.