I've finally got round to finishing off and putting online some of the astronomical activities I've had lying around for ages. There is an activity illustrating Hubble's Law with real data which was used with gifted and talented children back in May. They got the hang of it, but it is really more appropriate for older children. There is also a hands-on activity to build a Martian rover out of ordinary household objects. There is a sheet for the students with some ideas, and one for the teacher with some more information on real rovers. All these are linked from the resources page.