Attached Link: http://www.mmedia.is/~bjj/data/callisto/index.html

You can use a hi-res ball primitive or make a new sphere in UV-Mapper and save it out as "planet" with the map. There are all sorts of space-maps of the moons and planets online. They are cylindrically-mapped, IIRC. Here is a link to a map of Callisto, with information as to how the artist made the map... it is intended for 3d rendering rather than scientific accuracy or landing missions, but is still darned good. When I made planets, I just stretched the maps I found onto the template, making sure to save planet objs and their maps under new names. You can do this with real moons and planets or with fake ones that you've created (suppose that you need a water-world with oodles of islands, you can whip one up in PhotoShop once you get the feeling for wrapping them onto spheres.