2. http://www.li.net/~stmarya/phys97/home.htm
3. http://cse.ssl.berkeley.edu/sol/solarsyst/sol_solarsyst_artsat.html
4. http://sulu.lerc.nasa.gov/dglover/craft.html
5. http://155.229.34.2/~jtucker/students/astronamy/eighth/satellites/
6. http://surfnetkids.com/satellite.htm
7. http://geocities.com/CapeCanaveral/1092/sat.html
8. http://www.aec2000.it/amsat-i/ser/sat_db_i.htm
9. http://spaceboy.nasda.go.jp/Db/Kensaku_Html/Type19_e.html
10. http://thetech.org/exhibits_events/online/satellite/2/2.html