Cool app – Star Walk 2: Stars and Planets Review

My 4 year old son and I love this app. He loves space more than I do. We were using this app a few days ago and he asked to see Ganymede and Callisto (by name, Jupiter is his favorite). It's very difficult to zoom into the moons of Jupiter. I purchased all the additional content, and the moons were still not there. Could those be added (at least the ones we have imagery for)
Review by ipod geek on Star Walk 2: Stars and Planets.