Create out-of-this-world lessons with this inflatable solar system set. These astronomical objects inflate like beach balls and are up to 23" in diameter. Use them to illustrate concepts such as rotation, revolution, and the order, shape, and size of the planets and Sun. Each inflatable has attached loops for hanging. All eight planets are included, plus Pluto, the Earth's Moon, and the Sun. An electric air pump is also included for easy inflation and deflation.