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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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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