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PASADENA, Calif. — The Spitzer Space Telescope has discovered the biggest but never-before-seen ring around the planet Saturn, NASA’s Jet Propulsion Laboratory announced Tuesday.
Although the ring dust is very cold — minus 316 degrees Fahrenheit — it shines with thermal radiation.
The bulk of the ring material starts about 3.7 million miles from the planet and extends outward about another 7.4 million miles.
