Saturn is the sixth planet and orbits the sun about once every 29 1/2 Earth years. Classified as a gas giant (as are Jupiter, Neptune, and Uranus), Jupiter is the second largest planet in our solar system. It is also known for its rings, several bands of rock, ice, and debris that circle closely around Saturn. Two of Saturn's moons are actually larger than the planet Mercury, and one, Titan, has a significant atmosphere. The music is from Gustav Holst's seven-movement orchestral suite, The Planets Op. 32. This particular movement is called "Saturn, the Bringer of Old Age."