天王星有由直径小于10米的黑暗颗粒物质组成的暗淡环系统，是继土星环之后，在太阳系内被发现的第二个环系统。已知的13个清晰的环中，最亮的是ε环。
... molecular maser 分子微波激射、分子脉泽 Uranian ring 天王星环 gas relention age 气体变异法年龄 ...
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工艺发现了旋转轴，九个天王星环98度倾斜和一个额外的10个卫星。
The craft discovered the 98 degree tilt of the axis of rotation, nine rings around Uranus and an extra ten moons.
F环。还评述了天王星环以及行星环中的碰撞、光度理论和起源等问题的研究。
Work on Uranian rings and some general problems of the planetary rings including the collision process in the rings, the photometric theory and their origin are also elucidated.
这些水分至今还以冰冻的形式存在于土星环，木星的卫星欧罗巴，海王星、天王星以及数以十亿计的彗星之中。
Most of it is still there, frozen solid in, among other things, the rings of Saturn, Jupiter's moon Europa, the bodies of Neptune and Uranus and billions upon billions of comets.
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