A small collection of Astronomy sites around the net
which I find of some interest.
Sloan Digital Sky Survey
Keck Observatory
Herschel Space Observatory
The Chandra X-RAy Telescope
Hubble Telescope
Heaven's Above
Jet Propulsion Laboratory
Sky and Telescope
Visible Earth
Welcome To The Planets
Royal Astronomical Society of Canada
Journal of Cosmology
Astronomy North
NASA