- AbsoluteAstronomy.com
 - General facts and statistical information about planets, moons, constellations, stars, galaxies, and Messier objects. - Aladin Java: A Sky Atlas
- An interactive atlas allowing the viewer to visualise digitized images, superimpose entries from astronomical catalogues, and access data from databases.
- Astro Watch
- Guide to astronomy facts including facts on stars, planets, comets, quasars, and black holes.
- Astronomy and Astrophysics at NSSDC
- Astronomy for Kids
- Astronomy site specifically designed for kids and their parents. Includes sky maps, a beginners guide to star gazing, information about the planets, stars, eclipses, meteor showers, comets, and other celestial wonders.
- Astronomy HyperText Book
- Addresses cosmology, solar system geology, the properties of galaxies, planetary motion, interstellar medium, stellar evolution, and other related topics.
- Astronomy Interactive Network
- Detailed information about radio, optical, physics and the history of astronomy; with games, pictures, quizzes, glossary, timeline, links, and message boards.
- Astronomy Sight
- In-depth, concise web site about astronomy from Crowell Observatory.
- Astronomy Thesaurus
- Thesaurus of astronomy terms and synonyms in English, French, German, Spanish and Italian. From the Research School of Astronomy and Astrophysics.
- AstronomyDaily.com
- Offers real time astronomical data tailored to the viewer's location and time zone.
- Bad Astronomy
- Righting wrong ideas. Addresses astronomical and scientific misconceptions spread by movies, TV, the news, and popular beliefs.
- Better Living Through Astronomy
- General guide to astronomy . Includes articles and tips on telescopes. cosmology, astronomers, and more.
- Beyond Our Skies: Discovering the Cosmos
- Project presenting the history and basics of astronomy.
- Canadian Astronomy Data Centre
- Distribution centre for observatory archives, catalogues, and more.
- Encyclopedia of Astronomy and Astrophysics
- Articles covering cosmology, galaxies, interstellar medium, stars, the solar system, space missions, theoretical concepts, and more. Subscription required.
- Eric Weisstein's World of Astronomy
- Addresses the atmosphere, calendars, galactic and observational astronomy, remote sensing, the solar system, and the stars.
- FAQ - sci.astro
- Sci.astro is a newsgroup devoted to the science of astronomy. Its content ranges from the Earth to the farthest reaches of the Universe.
- Hands-On Universe
- Enables students to investigate the Universe while applying tools and concepts from science, math, and technology.
- International Year of Astronomy (IYA2009) (12)
- Journey into the Heavens
- Astronomy guide presenting information about our solar system, constellations, the evolution of the universe, space missions, astronomers, and more.
- Journey Through the Galaxy
- Explores our Solar System, the stars, extra-solar planets, the theories about the past and future of the universe, and human exploration of space.
- Multiwavelength Astronomy
- Explains astronomy's applications across the electromagnetic spectrum.
- Munich Astronomical Archive
- Data on astronomical objects.
- NASA Astrophysics Data System
- Abstracts on astrophysics, astronomy, instrumentation, geophysics, and physics. Plus the Los Alamos preprint server, articles, and catalogues.
- Neave Lab: Planetarium
- Virtual clickable Flash planetarium.
- Nick Strobel's Astronomy Notes
- Complete astonomy textbook for first-year college courses.
 Observing Night Sky in Singapore
- Includes CCD images of heavenly objects taken right from the heart of the city.- Online Planetarium Show
- Educational site about the discoveries of the Hubble Space Telescope, historical astronomers, mythology, and light pollution.
- Physics Astronomy Life
- Features information on relativity, quantum cosmology, search for extraterrestrial civilizations, and the origin of the universe.
- PlanetDiary
- Presents weekly geological, astronomical, meteorological, biological, and environmental news from around the globe, plus Internet activities and links to science resources.
- Sea and Sky
- Explore the splendors of the sea and the wonders of the universe through information, images, sounds, links, and interactive games.
- Simbad
- Brings together basic data, cross-identifications, observational measurements, and bibliography, for celestial objects outside the solar system: stars, galaxies, and nonstellar objects within our galaxy, or in external galaxies.
- SkyQuery
- Prototype of a Federated database application, relying on several data sets: the Sloan Digital Sky Survey, the 2MASS project, and the First radio survey.
- SkyView
- Virtual observatory dynamically generating images of the sky in different wavelength regimes from a static image database, intended as a quick look facility to see the heavens.
- Space Place
- Make a pop rocket that really works, solve a riddle, and dive beneath the surface of Mars. Do these things and more, and learn about space and astronomy at the same time.
- Spacebuffs.com
- Community for astronomy and spaceflight enthusiasts discussing space travel and exploration, sky gazing, astrobiology, and Martians.
- Stellar Neigborhood in VRML
- Thrilling 3D ride through interstellar space within 25 parsec of the sun. Database contains nearly 3000 stars.
- Virtual Journey into the Universe, A
- Interactive guide to the cosmos.
- World Book @ NASA
- Index of encyclopedia articles about the Earth's geology and atmosphere, the planets, celestial objects, astronomers, space missions, and other astronomy topics.
- Zoom Astronomy
- Enchanted Learning page dedicated to space and astronomy, designed for people of all ages and levels of comprehension.
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