- ARC Science Simulations
 - Creators of working models of the Earth and solar system based on satellite data, static and animated earth simulations, stock and custom pictures, and globes. - Astromart
- The global astronomy marketplace.
- Astronomer's Net
- Features telescopes, astronomy aids, science kits, rockets, and books, as well as other products to explore the vastness of space.
- Astronomy-Mall
- Directory of companies offering astronomy goods and services.
- Daystar Filters
- Sub-Ångstrom filter systems allow observers to explore many facets of solar research.
- Guide to Backyard Astronomy
- A 40 minute instructional video tape offering an introduction to astronomy.
- Kronia Communications
- Supports research in the field of planetary catastrophics by examining both current and past evidence in a variety of disciplines.
- Micro Luminetics, Inc.
- Slow scan, chilled, digital CCD cameras. High resolution, scientific grade CCDs; 12 or 16 bits; -70 degree C cooling without liquids.
- Monoptec Corporation
- Offers the fixed shutter dome, an enabling technology in observatory enclosures and satellite laser ranging, for astronomy, defence, and satellite communications.
- Observa-Dome Laboratories, Inc.
- Manufacturer of observatory domes, missile tracking, and laser ranging shelters.
- Radio-Sky Publishing
- Books and software for amateur radio astromomers. Jupiter noise storm prediction, and radio sky viewer software.
- Scopin' USA
- Astronomy entertainment company which provides guests with views of the universe through large, portable telescopes.
- SkyWatch
- Keeps subscribers abreast of astronomical events, such as satellite passes, meteor showers, and eclipses that can be observed from their location.
- Solar Terrestrial Dispatch
- Space weather, solar, and geophysical support services, including information regarding the state of the sun and its effect at the Earth.
- Spitz, Inc.
- Suppliers of immersive visualisation systems, planetariums, domes, and projection screens. Services include theatre design, systems integration, and full-dome video.
 UKSpace
- Includes company profiles and supporting resources related to U.K. space companies.- Wadsworth Publishing@
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