wsywsywsy看过来 网上发现Saturn's Rings的相关文章

Msmoon

造福G友

http://www.scientificamerican.com/podcast/episode.cfm?id=saturns-rings-may-be-remnants-of-a-10-12-13

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.
—Christopher Intagliata

wsywsywsy

顶！！！！！！！！！！！！！！！！！

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楼主你太强了！！！

Msmoon

popup 发表于 2013-5-27 09:53
楼主你太强了！！！

不是我强，是google强。。。

谁强也没用，运气不好本次也没上700， sigh...

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Msmoon 发表于 2013-5-27 18:22
不是我强，是google强。。。

谁强也没用，运气不好本次也没上700， sigh... ...

楼主在考试中有碰到你找到的这些文章中的某篇吗？

我觉得楼主你有这样的毅力可以查到这么多gmat的文章，肯定不简单，要换我google我就找不到。。。

Msmoon

popup 发表于 2013-5-27 18:58
楼主在考试中有碰到你找到的这些文章中的某篇吗？

我觉得楼主你有这样的毅力可以查到这么多gmat的文章， ...

运气不好，真没有。。。不过机井还是碰到一些的。等我先平静平静，之后马上上寂静。一个小时前刚考完。

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Msmoon 发表于 2013-5-27 19:07
运气不好，真没有。。。不过机井还是碰到一些的。等我先平静平静，之后马上上寂静。一个小时前刚考完。 ...

恩，好的哦，楼主不要担心，再接再励哈！！

750bob

楼主加油！