Saturn,last of the planets visible to the unaided eye, is almost twice as " far from the sun as Jupiter. It is second in size to Jupiter, but its mass is much smaller. Saturn specific gravity is less than that of water. Its diameter is about 71,000 miles at the equator, its rotational speed spins it completely around in a little more than ten hours. Saturn’s atmosphere is much like that of Jupiter, except that the temperature at the top of its cloud layer is at least 100 degrees F. lower. Saturn’s theoretical construction resembles that of Jupiter; it is either all gas, or it has a small dense center surrounded by a layer of liquid and a deep atmosphere.Saturn’s system begins about 7,000 miles above the visible disk of Saturn, lying above its equator and extending about 35,000 miles into space. The diameter of the ring system visible from the Earth is about 170,000 miles; the rings are estimated to be no thicker than ten miles. The ring particles are large chunks of material averaging a meter on each side.
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