托福听力课外资料练习：科学美国人60秒想土星卫星相关内容分享

在托福听力考试的备考过程中，科学美国人60秒相信大家一定用得比较多，那么大家平时是如何利用这个课外资料的呢?这里小编整理了科学美国人60秒：土星卫星相关的内容分享，大家一起来学习一下吧。

科学美国人60秒听力练习：土星卫星

科学美国人60秒英文文本

Galileo first spotted Saturn’s rings 400 years ago. But since then, scientists have been stumped about how they got there. Because the rings are almost pure water ice—and material in the outer solar system is generally an ice-rock mix. But a new analysis in the journal Nature may have solved the mystery. [Robin Canup, "Origin of Saturn's Rings and Inner Moons by Mass Removal from a Lost Titan-Sized Satellite"]

Today, Saturn's only massive moon is Titan. But Saturn’s fellow gas giant planet Jupiter has four big moons. So Saturn might once have had more—one of which could have had a rocky core surrounded by a shell of water ice. That moon would have interacted with a disk of gas surrounding Saturn at the time, dragging its orbit closer and closer.

As the moon spiraled in, tidal forces would have flexed its icy shell, stripping off chunks to build rings a thousand times more massive than Saturn has today. Eventually, ice boulders in the rings would have smashed into each other, spreading out the rings, and causing the outer edge to spawn icy moons—the small ones we find orbiting Saturn today.

As for that ancient moon’s rocky core? Saturn probably swallowed it up. Leaving Titan unique. And leaving scientists with a puzzle they finally may have solved.

科学美国人60秒中文翻译：

伽利略在400年前就指出了土星环的存在。但是，科学家一直没能弄明白土星环是如何形成的。因为土星环几乎全部都是纯水，而在通常情况下，在太阳系外层会以冰-岩石混合物的形式存在。不过一项在《自然》杂志上发表的最新研究可能解决了这个问题。

现在，土星唯一的大卫星是泰坦。而和土星同样是巨大气质行星的木星却有4颗大卫星。因此，土星可能曾经也有更多的卫星，而且其中一颗应该还有岩石内核，外面覆盖一层水冰外壳。这颗卫星在那时可能与土星外的气态光环发生了作用，造成它的轨道越来越靠近土星。

随着这颗卫星逐渐靠近土星，土星的潮汐力可能改变了水冰外壳的形状，撕裂大量的冰块，形成了一个是现在一千倍的超级土星环。最后，土星环里的冰块可能相互融合，使光环逐渐外延，在外光环层形成水冰卫星，这就是我们现在发现的绕着土星运行的卫星。

那遥远时代的岩石内核呢?可能被土星吞噬了。于是，留下了孤零零的泰坦，也给科学家留下了现在才能回答的难题。

1. stump n.树桩;残余部分

2. interact vi.相互作用，相互影响

3. spiral v. 成螺旋状下降, 成螺旋状旋转

4. chunk n.厚片，大块;相当大的部分(数量)

5. smash v.粉碎;狠打;猛冲

以上就是小编为大家整理的科学美国人60秒：土星卫星的文本以及翻译，大家练习的时候还可以找来音频资料一起练习，效果定会更好。最后，小编预祝大家托福考试能取得理想的成绩。

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