This is a great child-friendly place to find out about the planets and the universe. Click on the topics to see lots of info, images and games.
http://ictmagic.wikispaces.com/Science
Settle the argument of who's is truly bigger with this planet size comparison tool. View a image of each planet as it's real ratio.
http://ictmagic.wikispaces.com/Science
Stargazing Live is a wonderful BBC programme on air in January. The site has lots of great resources to help you understand the night's sky.
http://ictmagic.wikispaces.com/Science