Perfect for the young astronomer. The 'sun' is illuminated by a 1000-hr light bulb inside a yellow sphere to bring light onto the planets that orbit around it. The base of this model has planetary longitude marks so the planets can be set up to their correct positions. Includes a unique star dome to convert the solar unit into a planetarium show of major stars and constellations. Guide and activity sheets explain the latest facts in solar system science. Requires 4 C batteries (not included).