This solid space-related app is full of space-travel-related facts to discover.

Innovative features include the ability to record your own instructions. There are seven "chapters" presented in sequence - from dressing your astronaut (by dragging and dropping the parts into place), to exploring the Solar System. Each chapter contains five or so small interactive activities that let you get your hands into the concepts.

Teachers will like the additional materials, on the publisher's web site,as PDF documents.