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National Air and Space Museum
6th St. & Independence Ave., SW
In this outdoor exhibition, our solar system is presented at one ten-billionth actual size through 13 units—one each for the planets, the Sun, asteroids and comets, and 2 introductory units—that stretch 650 yards from the Air and Space Museum to the Smithsonian Castle. The model brings to life the great distances between the planets, illustrates their unique characteristics, and reveals the Earth's place in our solar system and the Sun's place among the stars. The exhibition was developed by the Challenger Center for Space Science Education, NASA, and the Smithsonian Institution.