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托福听力练习-科学美国人60秒:土星卫星泰坦上的尼罗河

2017-03-24 11:51:09来源：科学美国人60秒

点击查看>>科学美国人60秒音频：土星卫星泰坦上的尼罗河

　　科学美国人60秒听力练习：土星卫星泰坦上的尼罗河

　　科学美国人60秒英文文本

　　You've heard the old saying: "Da Nile ain't just a river in Egypt." And it's true. The Nile, as it turns out, is also a river on Titan—provided you squint and take a little creative license with your nomenclature.

　　NASA's Cassini orbiter recently took some radar readings of the Saturnian moon Titan. And what Cassini spotted there was a river system that NASA likens to a miniature version of the Nile River on Earth. It's long and relatively straight, just like the real Nile. But unlike the famed Egyptian river, Titan's river flows not with water but with liquid hydrocarbons such as ethane and methane.

　　Titan, the largest moon of Saturn, is the only place in the solar system other than Earth where large bodies of liquid coat the surface. In Titan's north polar region, the river flows some 400 kilometers into Ligeia Mare, a giant sea of hydrocarbons.

　　Recently planetary scientists proposed that NASA launch a floating spacecraft to explore the seas of Titan. But when NASA opted for a Mars lander instead, the plans for a space boat were scuttled.

　　中文翻译请点击下一页

本文关键字: 托福听力 科学美国人

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