J. CREWS, PhD
Heavens Above: Which satellites are visible from your hometown tonight?
Astronomy Picture of the Day: Cool new pics each day, plus an archive.
Potentially Hazardous Asteroids: Want to find out which asteroids have nearly missed us in the past or are going to come close to us in the future?
Bad Astronomy: Source on hoaxes and pseudoscience, in astronomy
CLEA Software: Great source for introductory level labs that run on Mac or PC. If you want to see basically how an astronomer determines the distance to Mercury or finds asteroids, as well as many other exercises, visit here.
Solar and Heliospheric Observatory: The best Sun pictures and movies
HST Picture Archive: The leader in cool astronomy pictures
CSICOP Online: Not really an astronomy site, but a good general source for debunking all of those silly myths. Has info on UFOs, the face on Mars, and even spontaneous human combustion!
Cassini-Huygens: Get the latest on the mission to Saturn and Titan!
NASA Homepage: What are they up to now?!?
Background : Kitt Peak National Observatory by Brian Stiles