Questions to answer for Space projects:

What stars and planets can you see from your house?
Where have all the stars gone? A study of light pollution
Estimating the rotational speed of the sun by using sunspots
How does the phase of the moon affect tides in Warrnambool / Port Fairy / your town?
Can you make a model of the solar system using simple materials from home?
Bill Nye's site has some fun experiments to try like the weightless clothespins.