Fourth, and least likely: Life on Titan!

第四，最小可能性：土卫六真的发现生命！

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On Titan, methane forms clouds and maybe even rain.

在土卫六上，甲烷可以形成云甚至降雨。

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The northeast just had its first big snow of the season. Meanwhile, on Titan, it was foggy.

美国东北部刚迎来今年冬季的第一场大雪，与此同时，在土星的卫星泰坦上，却是雾蒙蒙的天气。

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It will also slow down the speedy return of data from an experiment to measure winds on Titan.

BBC: NEWS | Science/Nature | Titan mission 'resounding success'

Weather of a slightly more familiar kind is thought to exist on Titan, the largest satellite of Saturn and the only moon in the solar system to have a thick atmosphere.

ECONOMIST: Comparative meteorology

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