Planetary Missions, Data & Information http://nssdc.gsfc.nasa.gov/planetary/planets.html
Planet Profiles http://pds.jpl.nasa.gov/planets/special/planets.htm
Solar & Heliospheric Observatory http://sohowww.nascom.nasa.gov
Tour the Solar System with Bill Arnett. http://www.nineplanets.org
This link has an astronomy link in addition to other topics. http://www.hilaroad.com
Impress your family and friends by predicting when the future full moons will be at this site run by the US Navy. http://aa.usno.navy.mil/data/docs/MoonPhase.php
Go to this NASA link to check the dates of past and future solar and lunar eclipses. http://sunearth.gsfc.nasa.gov/eclipse/eclipse.html
Click on "Ask an Astronomer." Brought to you by California Institute of Technology. http://coolcosmos.ipac.caltech.edu/