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托福听力练习-科学美国人60秒:月球水来自太阳风

2017-03-29 08:41:00来源：科学美国人60秒

点击查看>>科学美国人60秒音频：月球水来自于太阳风

　　科学美国人60秒听力练习：月球水来自于太阳风

　　科学美国人60秒英文文本

　　There's a tiny bit of water on the surface of the moon.

　　The ultra-thin dusting of water molecules was first detected in 2009 from spacecraft measurements. So where did the H2O come from? A chemical analysis of lunar samples now points to a likely culprit: the solar wind, a stream of charged particles emanating from the sun.

　　Researchers looked at agglutinates, a type of glassy lunar material brought back by Apollo astronauts. Agglutinates formed when micrometeorites hit the lunar surface and melted a bit of the powdery regolith. Tiny intact grains of soil were preserved within, like insects in amber.

　　Those agglutinates turn out to contain hydroxyl, or OH, a precursor molecule to water. And the OH's isotopic signature indicates that much of the hydrogen came from the solar wind. Add solar wind hydrogen to moon material that contains oxygen and, voila, water. The research is in the journal Nature Geoscience.

　　The researchers note that similar chemistry could be at work on Mercury, large asteroids and other airless bodies that endure the full blast of the solar wind. Meaning that even as the sun bakes those worlds, it delivers a bit of hydration.

　　中文翻译请点击下一页

本文关键字: 托福听力 科学美国人

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