- Windows to the Universe
 - User-friendly learning system on the earth and space sciences for use by the general public. From the University Corporation for Atmospheric Research. - Encyclopedia Astronautica
- Reference source containing links to information on rockets, spacecraft, programmes, astronauts, and more.
- Constants and Equations for Space-Related Calculations
- Star*s Family
- Collection of directories, dictionaries, databases, and related products on astronomy, space sciences, and related fields.
- Inquirer's Guide to The Universe
- Including space science fact, space science fiction, imaginary planet gallery, space story studios and a space story portfolio.
- Space Today Online
- Comprehensive directory covering space from earth to the edge of the universe.
- Millennium Group, The
- About many physical phenomena on earth and in the heavens.
- SpaceSounds
- Actual recorded sounds from space and audio from space missions.
- Advance Space
- Educational resource offering links to organisations, experts, and references.
- James Oberg
- Articles, speeches, columns, and more by the spaceflight operations expert and author.
- Heinlein Prize, The
- Provides a cash award of $500,000 to an individual or individuals for practical accomplishments in the field of commercial space activities.
- Space Calendar
- Covers space-related activities and anniversaries for the coming year, including links to related home pages.
- Innovative Technologies From Science Fiction for Space Applications (ITSF)
- European Space Agency initiative studying the technologies and concepts found in science fiction, in order to obtain imaginative and innovative ideas potentially viable for long-term development by the European space sector.
- Space Physics at the NSSDC
- Provides information about their spacecraft and missions.
- von Braun, Wernher (1912-1977) (1)
- Destination Space
- National Geographic Explorer investigates space travel and exploration.
- Educational Guide to Space & Astronomy
- Provides an overview of space science and astronomy, aimed at school children and teachers. From the University of Leicester.
- Glossary of Terms
- From the NASA Jet Propulsion Laboratory.
- Space Scientists Online
- Provides new and exciting information from space sciences and collects relevant information from previous space science projects.
- Scientific American: Making Money in Space
- Exploring the solar system turns out to be the easy part. The next great challenge will be creating profitable space enterprises.
- Space, Planetary, and Astronomical Cyber-Experience (SPACE)
- Easy to navigate guide to space and astronomy related web sites. Produced by the National Space Society.
- Slingshot Effect, The
- How spacecraft accelerate in planetary flybys by gravity assist.
- Discovery Space
- Explore the realm of space and learn about spacecraft and exploration. Discovery Space offers pictures, news, blogs, and videos.
- Google Book Search: Space Tourism
- Offers scientific chapters and articles on space tourism written by Michael Van Pelt, describing everything from what it feels like to be a tourist in space, to be hurled into orbit on top of a controlled explosion, to float around in a spacecraft, and to be able to look down on your hometown from above the atmosphere.
- HowStuffWorks: Space Tourism
- Offers introduction to how space tourism works, pertaining to concepts like commercial space travel, accommodations, affordability, and lots more relating to the same topic.
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