...前提是土卫六在过去比现在温暖许多(much warmer in the past than it is now)——而科学家在执行卡西尼任务(Cassini mission)的时候,并没证实这种情况。[/size]
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大体而言,使用太阳能或者极低能量放射性同位元素发电机,比如运用于卡西尼任务中的,更加便宜和简单。
By and large, it's cheaper and easier to go with solar power or very low-power radioisotope generators like the one that powers the Cassini mission.
卡西尼号的4年任务是探索这个环状星球。
Cassini was on a four-year mission to explore the ringed planet.
卡西尼环绕土星的任务目前已延长至2017年,以在其春秋分到冬夏至的季节变化时更好地研究这个复杂的行星系统。
The Cassini mission around Saturn has now been extended to 2017 to better study the complex planetary system as its season changes from equinox to solstice.
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