1.  College Level Physics (http://www.harcourtcollege.com/physics/college/)

2.  High School Level Physics (http://www.cpsurf.com)

3.  Physics 2000 (http://www.colorado.edu/physics/2000/index.pl)

4.  Hyper physics (http://hyperphysics.phy-astr.gsu.edu/hbase/hph.html)

5.  Physics Education (http://www.psrc-online.org)

1.  How Stuff Works (http://howstuffworks.com)

2.  Popular Science Magazine (http://popsci.com)

3.  Exploratorium Museum of San Francisco (http://www.exploratorium.edu/snacks)

4.  General Reference (http://www.refdesk.com/)

5.  Eisenhower National Clearinghouse (http://www.enc.org/)

1.  NASA (http://www.nasa.gov/search/)

2. The Star Gate  (www.sub.net.au/~hesketh/stargate.html)

3.  History of Astronomy  (www.astro.uni-bonn.de/~pbrosche/astoria.html)

4. The Planetary Society  (http://planetary.org/)

5.  Sky and Telescope  (http://www.skypub.com/resources/links/links.shtml)

6.   Views of the Solar System  (www.hawastsoc.org/solar/eng)

7.  Welcome to the Planets  (http://pds.jpl.nasa.gov/planets/)

8.  Ask the Experts: Astronomy  (www.sciam.com/askexpert/astronomy/index.html)

9.  Asteroid and Comet Impact Hazards  (http://impact.arc.nasa.gov/index.html) 

10.  Comets (including Deep Space One)  (http://encke.jpl.nasa.gov/) and

     (http://seds.lpl.arizona.edu/billa/tnp/comets.html)

11.  Meteorites 

(http://www-curator.jsc.nasa.gov/curator/antmet/metsfromant/metsfromant.htm)  and

(http://seds.lpl.arizona.edu/nineplanets/nineplanets/meteorites.html)

12.   Nova on Line  (http://www.pbs.org/wgbh/nova/spacewatch/)

13.  Hubble Space Telescope (http://hubble.stsci.edu/)

14.  American Astronomical Society  (http://www.aas.org)

15.  Astronomical Society of the Pacific (http://www.astrosociety.org)

16.  The Nine Planets (http://seds.lpl.arizona.edu/nineplanets/nineplanets/nineplanets.html#toc)