Facts and statistical information about planets, moons, constellations, stars, galaxies, and Messier objects.

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.

Learn about astronomy; goes into lots of details, and also has lots of astro-clip art.

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.

The use of multiple telescopes to produce high resolution images - commonly used at most modern observatories. A literature review article.

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.

Forum and chat for discussing astronomy.

General astronomy tutorial, education links, web courses, documents at the UCSD Center for Astrophysics and Space Sciences.

Fun facts and trivia relating to astronomy, space, science fiction movies. Most trivia items are submitted by users.

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.

Articles on astronomy, cosmology and space exploration, with a regularly updated sky guide and the latest space news.

Astronomical Internet resources by the Space Telescope Science Institute.

Extensive resources for astronomy.

We provide info about the beginning of universe and solar system. About the planets, quasars, the Milky Way, black holes. Life of a star, etc. Travel in space and extraterrestrial beings.

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A web encyclopedia. Over 500 entries, ranging from definitions to full articles.

From International Planetarium Society.

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 si

Leaflet from Royal Greenwich Observatory.