They are the first cirrus clouds seen on an outer planet.

它们是首次在外行星上发现的卷云。

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On Earth, NASA says, white wispy cirrus clouds are made of ice crystals.

美国航天局说，在地球上稀疏的白色卷云是由冰晶所组成的。

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The rare phenomenon is created by light reflected from ice crystals in high-up cirrus clouds.

而这个罕见现象是由于在位置较高卷云中的冰晶反射闪电而产生的。

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TC4 project will generate new data on the icy cirrus clouds that are formed in the upper atmosphere by heat-driven, or convective, storm systems that coalesce over warm waters in the tropics.

ECONOMIST: Climatology

He introduces the half-dozen main types of clouds as if they were his oldest friends: there is the towering, thunderous cumulonimbus, the beautiful cirrus, the fluffy, fine-weather cumulus.

ECONOMIST: Meteorology