Bring the wonder of the Solar System into your own room. Easy to assemble rotating planetarium is perfect for your desk or bedside. Total span 34cm. Secret code unlocks online solar system information. An orrery is a mechanical model of the Solar System that illustrates the relative positions and size of the planets, although totally accurate scaling cannot be achieved given the very large distances and differences. Future astronomers will love having this Solar System in miniature on their desktop or as room decor. Easy to assemble with detailed instructions. Included stickers have planetary symbols. Instructions include a secret code to unlock fascinating online facts about each planet in our Solar System.