For some basic information on the Solar System there are some pages here which I have written, originally for use in school.
 
 

A few other links

The Nine Planets
An excellent tour of the solar system.
The Web Nebulae
A tour of some deep space objects.
Sky Online
A commercial American site with up-to-date information.
SkyMap
Home page for an excellent shareware planetarium program.
 
Aurora Watch
How to predict the next display of the Aurora Borealis.
NASA
NASAs Jet Propulsion Laboratory.
Astronomy Shetland
Astronomy in Shetland.