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今天的主題,紫爆的空污與外星人也有關 ^0^

今日主題:Air Pollution Could Reveal ET's Home
空氣污染可以暴露外星人的家

洪欣老師推薦:托福聽力最好的課外教材:60-Second Science
康康精選托福會考的主題,堅持每天精聽一定會進步的哦!!

建議方法:
1. 先聽兩三遍 (不看文稿)
2. 再一句一句聽寫 (每句都要聽寫數遍,直到寫出85%以上的字)
3. 最後check文稿,看哪聽不出來,單字沒背過,還是發音不熟。
4. 堅持天天聽,就能每天進步哦。

MP3音檔 (按右鍵可下載聽):喜歡的同學,幫忙推或按讚哦~~
http://online1.tingclass.net/voas…/2014/20140824sa_space.mp3

只有音檔怎夠,聽不懂地方,不用怕,康康幫你準備好中英文稿了:

中英文稿:
Searches for extraterrestrial intelligence have focused on various signs of life. And one signature of alien intelligence may be, cough, cough, air pollution.
尋找外星人要專注於各種生命的跡象,而且外星人的一個鮮明標誌可能是,他們因為大氣污染而產生的咳嗽。

NASA's James Webb Space Telescope, due to launch in 2018, should be powerful enough to detect chlorofluorocarbons, CFCs. These ozone-destroying chemicals are used in aerosol sprays on Earth. Maybe another planet's denizens also employ them. You can find more 60-Second Space on chinavoa.com.
美國宇航局的詹姆斯韋伯太空望遠鏡降於2018年發射,應該強大到能夠檢測含氯氟烴(CFCs)。這些破壞臭氧層的化學物質在地球上被用做噴霧劑。也許另一個星球的居民也使用它們。

A new analysis of this idea notes that aliens would have to be heavy users. The Webb scope could only detect the chemicals if they were 10 times more prevalent than here on Earth. And even then, the planet would have to orbit a special kind of star, a white dwarf, for the CFCs to show up. White dwarfs—the ultimate destiny of stars like the sun—maximize the pollution signal.
關於這種想法的一項新的研究指出,外星人會是這種化學物質的重度使用者。如果他們對該物質的普遍使用量比地球上多10倍, 韋伯望遠鏡就可以檢測到該物質。即使如此,為了讓氯氟烴出現,該行星還必須圍繞一顆特殊的恆星進行軌道運行,即白矮星。白矮星——它是像太陽這樣的恆星的 最終命運,會最大化的加大污染信號。

The study is in the Astrophysical Journal. [Henry W. Lin, Gonzalo Gonzalez Abad and Abraham Loeb, Detecting industrial pollution in the atmospheres of Earth-like exoplanets]
該研究被發表在《天體物理學》雜誌上。

CFCs could hang around in a planet's atmosphere for a long time. So if an extraterrestrial civilization wised up and stopped polluting, we might still see the effects. Even a society that managed to destroy itself long ago could leave a chemical trace. Let's hope that's not how they discover us.
—Clara Moskowitz
氟氯烴會在一顆行星的大氣層停留很長一段時間,這樣如果外星人識破了我們的計謀,停止污染,我們仍然還可以看見效果。甚至是一個很久以前自我毀滅的社會文明都會留下化學的痕跡。讓我們祈禱外星人不是通過這點發現的我們吧!——克拉拉‧莫斯科維茨

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