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SENT In IN 1610 CD , , Italian JJ Galileo NP Galilei NP was VBD the DT first JJ astronomer NN to TO gaze VV at IN Saturn NP through IN a DT telescope NN . SENT To TO his PP$ surprise NN , , he PP saw VVD a DT pair NN of IN objects NNS on IN either DT side NN of IN the DT planet NN , , which WDT he PP later RB drew VVD as IN cup NN handles VVZ attached VVN to TO the DT planet NN on IN each DT side NN . SENT In IN 1659 CD , , Dutch JJ astronomer NN Christiaan NP Huygens NP announced VVD that IN this DT was VBD a DT ring NN encircling VVG the DT planet NN . SENT In IN 1675 CD , , Italian JJ born VVN astronomer NN Jean NP Dominique NP Cassini NP discovered VVD a DT gap NN between IN what WP are VBP now RB called VVN the DT A NP and CC B NP rings NNS . SENT Like IN Jupiter NP , , Uranus NP , , and CC Neptune NP , , Saturn NP is VBZ a DT gas NN giant NN . SENT It PP is VBZ made VVN mostly RB of IN hydrogen NN and CC helium NN . SENT Its PP$ volume NN is VBZ 755 CD times NNS greater JJR than IN Earth's NP . SENT Winds NNS in IN the DT upper JJ atmosphere NN reach NN 500 CD meters NNS per IN second JJ in IN the DT equatorial JJ region NN . SENT In IN contrast NN , , the DT strongest JJS hurricane NN force NN winds NNS on IN Earth NP top VVP out RP at IN about RB 110 CD meters NNS per IN second JJ . SENT These DT super JJ fast JJ winds NNS , , combined VVN with IN heat NN rising VVG from IN within IN the DT planet's JJ interior NN , , cause VV the DT yellow JJ and CC gold JJ bands NNS visible JJ in IN its PP$ atmosphere NN . SENT Saturn's NNS ring VVP system NN is VBZ the DT most RBS extensive JJ and CC complex JJ in IN our PP$ solar JJ system NN . SENT it PP extends VVZ hundreds NNS of IN thousands NNS of IN kilometers NNS from IN the DT planet NN . SENT In IN fact NN , , Saturn NP and CC its PP$ rings NNS would MD just RB fit VV in IN the DT distance NN between IN Earth NP and CC the DT Moon NP . 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