【科学60秒】繁星满天_英语听力练习mp3下载-科学-沪江听力酷

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【科学60秒】繁星满天

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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 ____1____ 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 ____1____ signatures of these red dwarf stars in eight massive ____2____ galaxies relatively close to us—between 50 million and 300 million ____3____ 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 leads astronomers to believe that there may be three times as many stars in the universe as they’d previously ____4____. The research was published in the journal Nature.
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 ____5____ red dwarfs.
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