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        Saturn's Largest Ring | NASA Planetary Sciences

        Learn about the startling discovery of a giant and previously unknown ring around Saturn in this video adapted from NASA. Saturn is well known for its ring system, which was first discovered hundreds of years ago by Galileo Galilei, although he did not understand its structure. In 2009, astronomers announced the discovery of an enormous, diffuse ring that starts about 6 million kilometers away from Saturn and extends another 12 million kilometers. The ring is so dark that it had escaped observation until the Spitzer Space Telescope detected its infrared radiation.

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