The Solar System : (collection of articles and activities) SpacePlace NASA
How Long is a Year on Other Planets?
Is There Ice on Other Planets?
How Long is One Day on Other Planets?
Why Are Planets Round?
How Did the Solar System Form?
How Do We Weigh Planets?
All About the Planets
What is the Kuiper Belt?
A Planet Without a Sun
The Planets:
Planet Study Project
Mars the Red Planet
Earth's Place in the Solar System
Online Games and Activities:
American Museum of Natural History OLOGY:
Cosmic Cookies (recipe for "planet" cookies)
Planetary Mysteries Solar System Scavenger Hunt
Stargazing