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托福听力练习-科学美国人60秒:银河系和卫星星系排列

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：银河系和卫星星系排列

　　科学美国人60秒听力练习：银河系和卫星星系排列

　　科学美国人60秒英文文本

　　Our Milky Way galaxy has two large satellite galaxies orbiting it. They're known as the Large and Small Magellanic Clouds. And humans have been aware of the existence of these celestial objects for at least a millennium.

　　Recently, researchers were curious about whether our configuration is fairly typical, or an astronomical anomaly. In other words, is our corner of the cosmos ordinary?

　　Now a new study finds that the Milky Way and its companion galaxies are an unusual combination, but they're not one of a kind.

　　Astronomers in the U.K. and Australia looked at thousands of galaxies to try to find an analogue of our arrangement. The search turned up two close replicas: each with a Milky Way–like galaxy accompanied by two galaxies comparable to the Magellanic Clouds.

　　But the researchers also concluded that such arrangements are pretty rare. Only half a percent of Milky Way–like galaxies have companions like ours.

　　The Magellanic Clouds may be transitory features. In a few billion years the Milky Way may absorb them completely. So someday our corner of the cosmos could be pretty ordinary after all.

　　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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