And that would mean the Earth's natural satellite may have always been too dry to host life.

这意味着月球这颗地球的的天然卫星可能由于过于干燥而无法存在生命。

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One such cost arises when a satellite has to take evasive action and thereby USES up fuel, reducing its life in orbit.

当一个卫星不得不回避时，这一费用上涨了，因此也会用尽燃料，减少在轨道里停留的时间。

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The propulsion subsystem is essential for maneuvering the MUOS satellite during transfer orbit to its final location as well as conducting on-orbit repositioning maneuvers throughout its mission life.

在把MUOS卫星变轨到最终位置以及执行任务寿命期内的在轨机动性重新配置上，该推进系统是很关键的。

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That could also allow commercial satellite companies to extend the life of hardware that's now written off when fuel for maneuvering thrusters runs out.

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The US space agency says the risk to life from the Upper Atmosphere Research Satellite (UARS) is 1 in 3, 200.

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Life remained good, even after satellite-based competition from DirecTV Group ( DTV) and Dish Network ( DISH) began to tighten things up a bit.

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