The document discusses using citizen science projects like Galaxy Zoo and Moon Zoo to engage children in annotating and classifying astronomical images through games on the Tiny Planets educational website. It describes the Moon Explorer activity, which has children annotate images from the NASA Lunar Reconnaissance Orbiter to estimate crater sizes and compare "boulderiness". It also outlines the development of The Universe Game, an intermediate-level strategy game intended to incorporate annotation of astronomical images as part of gameplay.