If the smaller planets are to be easily visible to the naked eye, large outdoor spaces are generally necessary, as is some means for highlighting objects that might otherwise not be noticed from a distance. The Boston Museum of Science placed models of the planets in major public buildings, all on similar stands with interpretive material. For example, the model of Jupiter, shown, is located in the cavernous South Station waiting area. The properly scaled, basket-ball sized model is 1.3 miles (2.14 km) from the model Sun which is located at the museum, graphically illustrating the immense empty space in the Solar System.