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托福听力练习-科学美国人60秒:宇宙远古星系

2017-06-13 09:27:00来源：网络

点击查看>>科学美国人60秒音频：宇宙远古星系

　　科学美国人60秒听力练习：宇宙远古星系

　　科学美国人60秒英文文本

　　Five very old galaxies are now known to astrophysicists, thanks to Albert Einstein. A century ago, Einstein predicted an effect called cosmic gravitational lensing. Picture a massive galaxy out in space. From our vantage point, a second galaxy happens to be behind the first galaxy.

　　That second galaxy should be hidden to us. Except that the nearer galaxy bends the light of the far galaxy coming our way. That light can sometimes become so distorted that it actually appears to ring the nearer galaxy. It’s called an Einstein ring, because he predicted that, too.

　　In the new study, researchers used the Herschel Space Observatory. The brightest spots on their sky map all turned out to be gravitationally magnified galaxies. The study is in the journal Science. [Mattia Negrello et al., "The Detection of a Population of Submillimeter-Bright, Strongly Lensed Galaxies"]

　　The observatory is really detecting infrared info, or heat, rather than visible light from the newly discovered galaxies. That radiation started coming our way when the universe was only two to four billion years old, less than a third of its current age. Researchers expect to find hundreds of new, old galaxies this way, along with new info about the early universe.

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本文关键字: 托福听力 科学美国人60秒

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