An Atlas of the Universe
- http://www.atlasoftheuniverse.com/
- Contains 3D maps of the universe zooming out from the nearest stars to the scale of the galaxy and out to the surrounding superclusters and finally to the scale of the known universe.
Astronomy Online
- http://astronomyonline.org
- Gives overview of the solar system, the Milky Way galaxy, extrasolar planets, cosmology and astrophotography. Includes images, additional resources, and forums.
Astronomy Today
- http://www.astronomytoday.com/
- Information and articles on astronomy, space and related topics. Also features a friendly forum and a telescope buyer's FAQ page.
Infrared Astronomy
- http://coolcosmos.ipac.caltech.edu/cosmic_classroom/ir_tutorial/
- All about infrared astronomy from NASA's infrared astronomy center: Discovery of infrared, what is infrared and infrared astronomy, history, the infrared universe, gallery, activities, discoveries, missions and a lot of links to IR astronomy sites.