Welcome to the paper galaxy, a cosmic collection of fantastic three-dimensional, modular paper projects. Some are realistic (a meteorite), others fanciful (an alien ship), and they range from very simple to elaborate. Just copy or trace the pattern--the instructions tell you how--and then cut, paste, and paint the paper to construct sun bursts, stars, black holes, moons, comets, even Martians that you can decorate with antennae. And once you've made...