The Cassini spacecraft surveys Saturn's outstretched ring system in infrared from a vantage point high above the planet's northern latitudes.
卡西尼号飞船用红外线在高出行星北纬度的有利位置调查土星的扩展环系统。
It is the third largest planet and has a ring system, which was discovered second to Saturn's.
这是世界第三大的行星，拥有环系统，这是第二次发现的土星。
Astronomers believe that Saturn's moons play a fundamental role in sculpting its elaborate ring system.
天文学家认为，土星的卫星在光环的形成中扮演着重要角色。
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