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Jewel of Our Solar System
Adorned with thousands of beautiful ringlets, Saturn is unique among the planets. All four gas giant planets have rings -- made of chunks of ice and rock -- but none are as spectacular or as complicated as Saturn's. Like the other gas giants, Saturn is mostly a massive ball of hydrogen and helium.

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accretion

Accumulation of dust and gas into larger bodies such as stars, planets and moons.

 
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accretion

Accumulation of dust and gas into larger bodies such as stars, planets and moons.