【Earth&Sky】地球高层大气吸收太阳能量_英语听力练习mp3下载-自然-沪江听力酷

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【Earth&Sky】地球高层大气吸收太阳能量

听力简介：

听写填空,只写填空内容,不抄全文,4个单词/词组+1个句子,不用写标号~

Astrophysicist Marty Mlynczak has discovered that our planet's [---1---] moves up and down. He describes it as "breathing" the sun's energy in and out.

Marty Mlynczak: From a satellite's [---2---] , if you're up there in orbit and you're going along, the breathing looks like the energy from the sun has come in, the high speed stream has come in, it's heated up the atmosphere, it's expanded it.

[---3---] It's made up of electrons and protons escaping through the sun's upper atmosphere and flying towards Earth.

Marty Mlynczak: Just like your house when it gets hot, the [---4---] kicks on and brings the temperature down. When these energy from the sun comes in and these high speed stream come in, they heat up the atmosphere.

And this is what activates the breathing. Earth's upper atmosphere expands from the heat, and contracts when it's released. The fluctuation corresponds with the sun's own solar wind cycles.

Marty Mlynczak: Every nine days, you all of a sudden have more [---5---] you're running into. The atmosphere has gotten denser and expanded it, and if you're a satellite at a fixed altitude, all of a sudden you're running into more matter. When you've got people in orbit, even a little tiny piece of space junk could be catastrophic if you hit the space station.

Mlynczak says that's one important reason for scientists to understand this atmospheric breathing.

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