Instead they are limited to directly measuring objects in orbit: the galaxy's gas and stars, as well as distant satellite galaxies and star clusters.

相反的，他们只能局限于直接测量轨道上的物体：银河系中的气体，恒星，以及较远的卫星星系和星团。

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In future, it might even be possible to observe this process with the planned LISA satellite, an instrument capable of measuring the gravity waves that the two merging black holes emit.

未来，科学家们还有可能用丽莎卫星进行观测，丽莎卫星可以测量到两个正在合并的黑洞发射出的引力波。

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The MPA estimates rainfall by combining measurements from many satellites and calibrating them using rainfall measurements from the Tropical Rainfall Measuring Mission (TRMM) satellite.

多卫星降水分析是结合多个卫星的监测结果，运用热带降雨观测卫星的监测结果进行校准，在此基础上估测降雨量。

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The system can be monitored by satellite and by measuring trees in the forest, Drax says.

BBC: Biomass may hinder climate fight

The Esa satellite's radiometer works by measuring the natural emission of microwaves coming up off the planet's surface.

BBC: Smos 'space chopper' returns first global maps

To substantiate his argument, Dr Rosenfeld then turned to another satellite, the so-called Tropical Rainfall Measuring Mission.

ECONOMIST: Weather and pollution