Astronomy Picture of the Day - A NASA sponsored site which features a different image or photograph of our universe each day with a brief explanation written by a professional astronomer.
space.com - The name pretty much says it all...
Star Date On-Line - This site is a great resource for those with an interest in astronomy.
space weather.com - "News and information about the Earth-Sun environment."
Cal Sky - The Calculated Sky
Robert Gendler -The Universe in Color
Roth Ritter -Dark Atmospheres
Russell Croman - Russell Croman Astrophotography
Wes Stauffer - Astrofoundry
Dave Kodama - Astrophotography by Dave Kodama
Garth Buckles - Wide Field Astrophotography
Wolfgang Promper - Wolfgang Promper's CCD Images
Al Kelley - Al's CCD Astrophotography Page
Ken Crawford - Astrophotography by Ken Crawford
Adam Block - Caelum Observatory
Tom Davis - Painting With Starlight
R. Jay Gabany - Cosmotography
Mike Halderman - Astrophotography by Mike Halderman
Neil Fleming - Fleming Astrophotography
Bob Fera - Images of the Universe
Steve Cannistra - Starry Wonders
Jay Ballauer - All About Astro