Until this week Saturn's small moon Rhea was the only known solid space object thought to have a ring. (Other known ringed bodies, such as Saturn, are mainly gaseous.)

直到本周土星的小卫星土卫五还被认为是唯一具有环的立体空间物体。(其它已知有环的天体，例如土星，大部分是气态的。)

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"There's every reason to think the same processes are happening on other planets, such as Jupiter and Saturn," Dwyer said.

“有充分的理由可以认定，同样的进程也会在其他行星，如木星和土星上发生”，德怀尔说。

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Hydrogen is the most abundant element in the universe and is a major component of giant planets such as Jupiter and Saturn.

氢是宇宙中分布最为广泛的元素，它是类似于木星和土星这样的巨行星主要的构成成分。

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Other activities for Cassini scientists during the extended mission will include monitoring seasons on Titan and Saturn, observing unique ring events - such as the 2009 equinox when the Sun will be in the plane of the rings - and exploring new places within Saturn's magnetic "envelope" - or magnetosphere.

BBC: Nasa extends Saturn probe mission

She became such a familiar figure at her local Saturn dealer and so knowledgeable about its lineup that she was hired as a sales consultant.

CNN: Saturn owners hope GM doesn't abandon them