Check out Online from Jupiter, a special K-12 page. This extensive multimedia site allows you to explore all 70 planets and moons in the solar system. A series of pamphlets distributed by the Royal Greenwich Observatory. Non Technical information on the Solar System, Stars, Time, Seasons, Supernovas. You can find out background information, and see the Comet impact and its effects on the surface of the planet.
Explanations are brief and clear, there are lots of pictures, and even a few animations.
A site that's a little out of this world. The Planetary Geosciences group explores the processes that shape planetary surfaces. The structure, composition, and evolution of solid-body planets, satellites and small bodies throughout the solar system provide important references for understanding the Earth. StarChild Project Made for kids. Learn about the universe.