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Astronomy Cafe http://www2.ari.net/home/odenwald/cafe.html
Hands On Universe http://hou.lbl.gov/
Campaign for Dark Skies http://www.u-net.com/ph/cfds/
NASA Teacher Resource Centers http://nssdc.gsfc.nasa.gov/planetary/states03.html
Careers in Astronomy http://www.aas.org/education/career.html
NASA's K-12 Internet Initiative http://quest.arc.nasa.gov/
Space Development and Science http://www.cyberpursuits.com/space/
Planetary Society http://planetary.org/
SETI League http://seti1.setileague.org/homepg.html
Astronomical Society of the Pacific (ASP) http://www.astrosociety.org/
Solar System Tour http://www.seds.org/nineplanets/nineplanets/nineplanets.html
Space Educators' Handbook http://vesuvius.jsc.nasa.gov/er/seh/
Star Watch UK: Survey of Sky Brightness http://www.u-net.com/ph/starw-uk/