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http://www.aas.org
American Astronomical Society (AAS)Established 1899, AAS is the major professional organization in North America for astronomers, other scientists and individuals interested in astronomy.
http://www.cnn.com/TECH/space/
Offers news stories related environmental issues, archeology, astronomy, technology, geology and other science topics.
http://www.nasa.gov/news/highlights/
Whats new in NASAs space science programs.
http://www.space.com
Offers space, astronomy and technology content, including information, education, entertainment and business news.
http://www.stsci.edu/resources/
Contains astronomy resources, space data archives, visitor information, and research opportunities.
http://www.iau.org/
The International Astronomical Union (IAU)Founded in 1919, has a mission to promote and safeguard the science of astronomy through international cooperation. The organization is also the internationally recognized authority for assigning designations to celestial bodies and surface features on such bodies.
http://www.seds.org/billa/twn/
Features images of Nebulae organized by Bill Arnett. Includes glossary, image list, and sources.
http://www.usno.navy.mil/
General information, FAQ, tour information, history, equipment information, inexpensive digital astro imaging, and instructions on constructing an 8 inch Dobsonian.
http://adc.gsfc.nasa.gov/
NASAs ADC is a resource for astronomical data, catalogs, and journal tables.
http://www.alcyone.de/
Features the following programs: an ephemeris calculator, a collection of astronomical data in electronic form, Planet Orbits, C88, and Planetary, Lunar, and Stellar Visibility.
http://www.aavso.org/
American Association Of Variable Star Observers (AAVSO)Professional and Amateur collection, research, and analysis of variable star observations.
http://curious.astro.cornell.edu/
Questions answered by graduate students, including a question and answer archive, information on the solar system, the universe, SETI, observational astronomy, careers and history.
http://www.aui.edu/
Manages astronomical observatories for universities and National Science Foundation, press releases and information.
http://www.aura-astronomy.org/
Consortium of educational and other non-profit institutions that operates world-class astronomical observatories.
http://astromb.free.fr
Advanced software for astrometry, photometry, robotic observations. Huge database of images and catalogs. Works with MaximDL and ASCOM. Free downloads.