Absolute Astronomy
Facts and statistical information about planets, moons, constellations, stars, galaxies, and Messier objects.
http://www.absoluteastronomy.com/

Astronomy Today
Information and articles on astronomy, space and related topics. Also features a friendly forum and a telescope buyer's FAQ page.
http://www.astronomytoday.com/

Astronomical Applications Department, U.S. Naval Observatory
Computes the position, brightness, and other observable characteristics of celestial bodies, as well as the circumstances of astronomical phenomena. Includes information on calendars and related topics.
http://aa.usno.navy.mil/

Eric Weisstein's World of Astronomy
A web encyclopedia. Over 500 entries, ranging from definitions to full articles.
http://scienceworld.wolfram.com/astronomy/

Astronomical Pseudo-Science: A Skeptic's Resource List
List of links for those, who want to examine theories that are on the fringe of accepted scientific thought that are related connected to astronomy. A few examples are astrology, UFO's, the "Face" on Mars, and ancient astronaut theory.
http://www.astrosociety.org/education/resources/pseudobib.html

Astronomical Optical Interferometry
The use of multiple telescopes to produce high resolution images - commonly used at most modern observatories. A literature review article.
http://www.geocities.com/CapeCanaveral/2309/page1.html

Space.com - The Greatest Myths, Hoaxes & Mysteries in Astronomy and Space Science
Article briefly discussing 21 topics.
http://www.space.com/scienceastronomy/myths_hoaxes_030325.html

Logarithmic Maps of the Universe
Show universe in terms of distance from Earth center. Includes such things as satellites, planets, stars, nebulae, and galaxies, out to cosmic microwave background radiation from the Big Bang.
http://www.astro.princeton.edu/~mjuric/universe/

Infrared Astronomy
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.
http://coolcosmos.ipac.caltech.edu/cosmic_classroom/ir_tutorial/

Astronomy for All
Index with graphics and illustrations about stars, the Solar System, cosmology and Galileo.
http://www.pd.astro.it/E-MOSTRA/A0000HOM.HTM

Astronomy Online
Gives overview of the solar system, the Milky Way galaxy, extrasolar planets, cosmology and astrophotography. Includes images, additional resources, and forums.
http://astronomyonline.org

Stars and Planets
Information about interesting stars and planets in the galaxy, as well as astral bodies outside the Milky Way. Includes photos.
http://jumk.de/astronomie/astronomy.shtml

Astronomy Forum
Message board.
http://jollyrogerwest.com/forumdisplay.php?f=9

An Atlas of the Universe
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.
http://www.atlasoftheuniverse.com/

AstroWeb
Astronomical internet resources from the National Radio Astronomy Observatory.
http://www.cv.nrao.edu/fits/www/astronomy.html

AOL Space
Get space and astronomy news, photos, and videos.
http://reference.aol.com/space/main

Beyond Earth - Everything Not on Earth
Provides information about the beginning of universe and solar system. About the planets, quasars, the Milky Way, black holes. Life of a star. Travel in space and extra terrestrial beings.
http://www.geocities.com/beyondearth2/M1.htm

Astronomy Facts and Trivia
Fun facts and trivia relating to astronomy, space, science fiction movies. Most trivia items are submitted by users.
http://www.funtrivia.com/ql.cfm?cat=59

Astronomy Education and Outreach
General astronomy tutorial, education links, web courses, documents at the UCSD Center for Astrophysics and Space Sciences.
http://casswww.ucsd.edu/public/astroed.html

The Naming of Stars
Leaflet from Royal Greenwich Observatory.
http://www.nmm.ac.uk/server/show/conWebDoc.309