【科学60秒】日薄西山，也不离不弃_英语听力练习mp3下载-科学-沪江听力酷

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【科学60秒】日薄西山，也不离不弃

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Astronomers have already discovered hundreds of exoplanets. But ____1____ the new kid. Which is orbiting a kind of star that models say it shouldn’t.
Researchers found the exoplanet while looking at the star HIP 13044 — or Sergio, for Star of Extra-Galactic Origin. It’s in what once was a separate galaxy, which the Milky Way ____2____ billions of years ago.
The scientists saw Sergio wobbling due to the gravitational tug of a Jupiter-sized gas planet, which the scientists dubbed Sergio Junior. They detail their find in the journal Science.
You don’t ordinarily find planets ____3____ a star like Sergio. First, it's really old — past the Red Giant phase, when stars balloon in size and ____4____ planets in close orbits. And planets tend to form around metal-rich stars, like our Sun. But Sergio has only one percent the metal content of our Sun. That doesn't ____5____ one widely accepted model of planetary formation.
The Sergios may offer a glimpse of the future of our own planetary system — in about five billion years. We hope to be back then with an update.
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