Haven't learned enough? Here are some other great sites for discovering new things about astronomy!
Arizona-Based Sites
Catalina Sky Survey Observatory
Lunar and Planetary Laboratory (LPL) U of A
Steward Observatory Mirror Lab - HOME
Tucson Amateur Astronomy Association
U of A Department of Astronomy and Steward Observatory
NASA Sites
Human Space Flight (HSF) - Realtime Data
Jet Propulsion Laboratory (JPL)
Kepler Mission: A Search for Habitable Planets
Mars Global Surveyor - Welcome to Mars!
NASA - Cassini-Huygens Close Encounter with Saturn
Photos from the Hubble Space Telescope
Other US Sites
Lockheed Martin Solar and Astrophysics Laboratory
International Sites
Assembly of International Space Station
Manitoba Museum Science Gallery & Planetarium
The Hubble Heritage Project Website
Observatories
ESO - The European Southern Observatory
Giant Telescope Magellan Organization (GMTO)
US Naval Observatory Astronomical Applications Dept.
Instrumentation Sites
Improved Control for a Light Pollution Meter
Image Galleries
Amateur Astronomy - Astrophotos of the Northern Constellations
Arizona Sky - Astronomy Astronomical Celestial CCD Imaging Photography -