National Aeronautics and Space Administration
<http://www.nasa.gov>
NASA's official website for current events, future plans, and recent discoveries in Space. Includes pictures from space.

Jet Propulsion Laboratory at CalTech (JPL)
http://www.jpl.nasa.gov
Official site for the Jet Propulsion Laboratory. Great source for images of planets, stars and galaxies, current mission news and other space information. Particularly nice is the interactive image page directly accessible by following: http://photojournal.jpl.nasa.gov/index.html

Stardate Online
http://stardate.org/
It's a dictionary, it's an almanac, it's a repository of information on the stars : courtesy of the University of Texas at Austin. The main library subscribes to this magazine and has current issues

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