Assemble and paint your own planetarium. Includes 8 snap together planets, sun and stand that allows the orbits of the solar system. Scientists know a lot about the solar system, but they have no way of determining just how big the universe is. Our Solar System consists of many objects. Planets, dwarf planets, moons, the asteroid belt and the Kuiper belt. All gravitationally bound to orbit the Sun these objects travel around the solar system. The Sun is our star, central to everything, followed by the four small terrestrial planets – Mercury, Venus, Earth and Mars. In the vast expanse after Mars is the asteroid belt, made up of asteroids, debris of ice and rock. Uranus and Neptune are classified as ice giants. Beyond Neptune lies the Kuiper belt – mainly objects comprised of ice – and Pluto, a dwarf planet. Other objects in the solar system include comets, dust clouds, and natural satellites.