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托福听力练习-科学美国人60秒:钻石行星

2017-04-21 09:17:00来源：科学美国人60秒

点击查看>>科学美国人60秒音频：钻石行星

　　科学美国人60秒听力练习：钻石行星

　　科学美国人60秒英文文本

　　Say you need a diamond. You could go down to the jeweler, or you could put some carbon deep underground and let it sit for a couple billion years. Or you could hop in a starship and cruise 4,000 light years over to a dead star called pulsar J1719-1438.

　　The pulsar is exotic on its own—it's a super-dense remnant of a star spinning at about 10,000 rpm. But far more curious is the world orbiting it, which might be called a planet if it weren't so strange.

　　It's about as massive as Jupiter, but much more compact. It may be the remains of a carbon-rich white dwarf star. But it's been mostly cannibalized by its pulsar companion, and is now just a shadow of its former self.

　　The object’s incredible density makes it subject to great internal pressure. And that pressure, acting on the carbon-rich makeup of the white dwarf, may have crystallized much of it to the particular form of carbon we call diamond. That's according to new research in the journal Science. [Citation to come.]

　　The next step for astronomers is to find out if the diamond planet has rings.

　　—John Matson

　　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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