Official number of all planets natural satellites on home page, just scroll
down. Just about any other inforamtion you could want on every planet also
available.
NASA Website for Planets- Resource 1
National Geographic website for the solar system and all 8 planets. Good
information, but you have to hunt a bit to find what you may need. Great
information though!
National Geographic Website- Resource 2
Basic information about all planets. A good starting point for planet
information, but not as detailed as other sites.
Kid's Astronomy Website- Resource 3
Has a comparative table/chart on a bunch of planetary statistics and
characteristcis, including rings, natural satellites (moons), density,
diameter, gravity, etc.
Windows to the Universe Website- Resource 4
Comprehensive information about all 8 planets. Nice details, easy to follow
and understand.
Nine, er. Eight Planets of Solar System Multimedia Website- Resource 5
Other Resources