This site was recently given to me for my space obsessed 10 y.o. daughter:

http://www.zooniverse.org/projects

She has literally spent hours since then going through the different categories.

Our daughter has been obsessed with space since she was 2 and it's showing no sign of ever abating. Her knowledge level is going to make her first year at highschool an interesting one to work out though as they study the solar system in first term - and she's more interested in the theory of black holes smile

Nat