Facts and statistical information about planets, moons, constellations, stars, galaxies, and Messier objects.
An Introduction to Astronomy
Learn about astronomy; goes into lots of details, and also has lots of astro-clip art.
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. Site has extensive information on astronomical phenomena, calendars, and related topics.
Astronomical Pseudo-Science: A Skeptic's Resource List
List of resources for those who want to examine with a skeptical eye some of the claims at the fringes of science that seem connected to astronomy.
Largest astronomy-related mailing list database with full-text searchable archive.
Astronomy Campfire Chat
Forum and chat for discussing astronomy.
Astronomy Education and Outreach
General astronomy tutorial, education links, web courses, documents at the UCSD Center for Astrophysics and Space Sciences.
Astronomy Facts and Trivia
Fun facts and trivia relating to astronomy, space, science fiction movies. Most trivia items are submitted by users.
Astronomy for All
Extensive index full of graphics and illustrations about stars, the Solar System, cosmology and Galileo.
Resources, searchable forums and searchable lists of organizations providing astronomy services.