Menlo-Atherton High School Library
Siteseeing
Astronomy Sites
Bad Astronomy
Chabot space and Science Center
Hubblesite
Jet Propulsion Lab (JPL)
The Mars Project
NASA
NASA APOD
Planet Quest - the Search for Another Earth (JPL)
SETI Institute
SOHO Project (NASA)
Space.com - space exploration news
Spaceweather.com