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托福听力练习-科学美国人60秒:范艾伦辐射带探测器

2017-04-02 16:24:00来源：科学美国人60秒

点击查看>>科学美国人60秒音频：范艾伦辐射带探测器

　　科学美国人60秒听力练习：_______

　　科学美国人60秒英文文本

　　It's a dirty job, but two NASA spacecraft are ready to do it.

　　On August 23rd, NASA plans to launch two spacecraft into the radiation belts around Earth. The twin Radiation Belt Storm Probes will investigate high-energy particles held in place by Earth's magnetic field. Those fast-moving protons and electrons form two bands known as the Van Allen radiation belts, after physicist James Van Allen, who discovered them in 1958.

　　The two NASA probes will study how the belts formed, and what makes them swell up from time to time. The outer radiation belt in particular can change quickly in response to the sun's outbursts of charged particles, also known as solar storms.

　　The Van Allen Belts are a nuisance to some spacecraft, and they could pose a hazard to future manned missions as well. But the Radiation Belt Storm Probes will call those harsh environs home. The spacecraft will fly through the belts for two years, measuring charged particles, plasma waves and magnetic fields in Earth's vicinity.

　　NASA hopes that the mission will help illuminate the complex physics of the stormy near-Earth environment. And, perhaps, help future spacecraft weather that storm.

　　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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