 Amateur (1,243) - Organizations; Astrophotography and CCD Imaging; Amateur Telescope Making |
| Associations (21) - Amateur Clubs; Space; Mars Society |
| Business (405) - Telescopes, Binoculars and Accessories; Domes and Observatories; Meteorites |
| Data Archives (73) - Stellar and Astrometric; Supernovae and Remnants; Solar System |
| Directories (14) - Amateur Organizations |
| Education (43) - For Kids; History; NASA Educational Materials |
| History (170) - People; Worldviews; Instruments |
 Humor (5) |
| Images (62) - Amateur Astrophotography; NASA; Space |
| In the Arts (4) - Visual Arts; Children's Space Books |
| Institutions (392) - Observatories; Planetariums; Research Centers |
| News and Media (18) - Space Exploration |
| Popular Topics (1) - Amateur Astronomy; NASA; Relativity |
| Publications (42) - Journals; Magazines; Newsletters |
| Regional (0) - Philippines; Poland; United Kingdom |
 Shopping (45) - Space Memorabilia; Space Novelties |
| Software (158) - Desktop Planetarium and Charting; Image Processing and Data Analysis; Computational Astrophysics |
| Women (21) - History |
List of web sites about Science: Astronomy. Links and information. Amateur; Solar System; Business
