Astronomy Resources

NASA

Space News

Space Weather

Hubble Space Telescope

Astrobiology.com

New General Catalogue

SETI - Center for the Study of Life in the Universe

Arecibo - National Astronomy & Ionosphere Center

Skyview - NASA's virtual telescope.

Google Sky - Explore far-away galaxies, nebulae, and more. View constellations and the movements of the planets.

Celestial Sphere - Very impressive online virtual planetarium.

AstroViewer - Dirk Matussek's really well done planetarium applet with 1400 stars. Nice user interface. Can generate printable charts (pdf format too.)

Sky View Cafe - Another virtual planetarium with planetary orbits and ephemeris, calendar, and Jovian/Saturn moons. Easily jump to a number of celestial events.

Sky & Telescope Interactive Sky Chart - A planetarium applet from Sky and Telescope magazine. Can generate printable sky charts.

Stars and Constellations - Information and views of the constellations. Includes interactive star charts.

Fourmilab - John Walkers's collection of online software including Earth and Moon Viewer, Solar System Live and Your Sky.

GeoAstro Applet Collection - Juergen Giesen's collection of small astronomy applets.

Night Sky Observer - Lots of astronomy news.

Star Journey: The Heavens - Star Chart @ nationalgeographic.com

SEDS - Home of Nine Planets Solar System Tour, Messier Deep-Sky Catalog, and various other gems.

Heavens Above - Satellite and star observation maps.

Virtual Solar System - Virtual reality tour of the solar system from National Geographic.

Solar System Simulator - Generate pictures of solar system bodies from many different viewpoints. From NASA/JPL/Caltech.

Orbiter - A visually stunning and realistic spacecraft simulator for Windows.