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托福听力练习-科学美国人60秒:宇宙中的繁星

2017-06-10 09:27:00来源：科学美国人60秒

点击查看>>科学美国人60秒音频：宇宙中的繁星

　　科学美国人60秒听力练习：宇宙中的繁星

　　科学美国人60秒英文文本

　　The discovery that elliptical galaxies have many more red dwarf stars than the Milky Way means that the universe might have three times as many total stars as previously thought. Cynthia Graber reports

　　To many who stare up at the heavens, the stars may seem simply uncountable. Of course that’s not the attitude of astronomers. But they’ve made a discovery that means there are probably a lot more stars in the universe than they thought.

　　Red dwarfs are stars that are only 10 to 20 percent as massive as our sun. They’re so faint that astronomers weren’t able to detect them in any galaxies other than our own Milky Way, and neighboring ones.

　　So researchers used sensitive instruments at the Keck Observatory in Hawaii. They found faint signatures of these red dwarf stars in eight massive elliptical galaxies relatively close to us—between 50 million and 300 million light-years away. And they discovered that these galaxies were home to 20 times as many red dwarfs as there are in the Milky Way.

　　The finding means leads astronomers to believe that there may be three times as many stars in the universe as they’d previously theorized. The research was published in the journal Nature. [Pieter van Dokkum and Charlie Conroy, A substantial population of low-mass stars in luminous elliptical galaxies]

　　And a recently discovered exoplanet orbiting a red dwarf had some Earth-like qualities. Lead researcher Pieter van Dokkum says there could be trillions of Earths orbiting the ubiquitous red dwarfs.

　　—Cynthia Graber

　　中文翻译请点击下一页

本文关键字: 托福听力 科学美国人60秒

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