Tethys
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Saturn's third moon. Discovered by G.D. Cassini in 1684. Orbital radius 294,750 km (4.89 times the radius of Saturn), orbital period 1.887802 days. It seems to be made mostly of ice. The surface topography is complex, with a 100 km wide, 3 km deep groove running north to south that circles half the moon. Source : Heibonsha Encyclopedia About MyPedia Information |
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土星の第III衛星。1684年にG.D.カッシニが発見。軌道半径29万4750km（土星半径の4.89倍），公転周期1.887802日。ほとんど氷でできているらしい。表面の地形は複雑で，南北に走る幅100km，深さ3kmの溝が衛星を半周している。
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