If you are an elementary school science teacher, Solar System 3D Simulator probably will help you in explaining how the solar system works. Since this is a simulator, it shows you how the satellites of the planets rotate and how the planets go round the sun. It's not a program like the World Wide Telescope which shows you the simulation of the whole universe, but this one is more suitable for young children. Parents can also help their children learn by watching the simulation.
Solar System 3D Simulator 3 also has the following features like: planetary information, zoom viewing, adjusting the speed of revolution of the planets and the rotation of the satellites. You can also view the orbit or hide it. Therefore the 3D planets are in low-quality graphics but this program is still useful for basic understanding of the universe. Click here to download.