http://www.kbears.com/science.html
American site good for planets
http://www.sciencemuseum.org.uk/on-line/kids/index.asp
http://www.exploratorium.edu/science_explorer/index.html
http://amazing-space.stsci.edu/resources/explorations/
http://www.lhs.berkeley.edu/kids/
Brill American Science games and investigations
http://www.fourmilab.ch/earthview/vplanet.html
Satellite images of the Earth and Moon