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如何捕捉冰矮星——崔顿

How to catch a Dwarf Planet -- Triton MM#3

海王星的14个卫星是一个奇怪的群体
The 14 moons of Neptune are a strange bunch.
它们大部分是土豆形状的冰和岩石碎片
Most of them are small potato shaped pieces of ice and rock.
而且部分卫星离海王星非常远——绕行海王星一周需要29年
Some are so far away from Neptune that they need 29 years to circle Neptune once.
几乎所有的这些卫星都是被海王星的引力捕获的
Almost all of them are asteroids trapped by Neptune’s gravity.
这些卫星99.5%的质量都集中在崔顿上
99.5% of all the mass around Neptune is concentrated in Triton.
它是第七大卫星
It’s the 7th biggest moon,
并且比太阳系中其他所有已知卫星都要厚重得多
and more massive than all other known moons in the solar system
也就是说已知的所有卫星都比崔顿小
that are smaller than itself combined.
它的表面积相当于俄罗斯与澳大利亚的土地面积总和
Its surface area is about as big as the mainland of Russia and Australia together.
我们知道在太阳系中仅有四个地质活跃的卫星 而崔顿就是其中之一
Also, Triton is one of only four objects in the solar system that we know is geologically active.
崔顿的绕行轨道方向“错误” 这个方向与海王星的自转方向相反
Triton orbits Neptune in the ‘wrong’ direction, against the rotation of Neptune,
像崔顿这样大的卫星有一个逆行轨道在太阳系中很特别
which is unique in our solar system for an object as big as Triton.
我们可以得出的结论是崔顿不总是海王星的一个行星
We can conclude from this that Triton hasn’t always been a moon of Neptune,
可能是遇到海王星后被其捕获的一个矮行星
but probably was a dwarf planet that was forced into submission by Neptune,
当太阳系更年轻而且更混沌的时候
when the solar system was younger and more chaotic.
最受欢迎的学说是崔顿原先是围绕太阳旋转的一个双星系统的一部分
The most popular theory here is that Triton was once part of a double system,
当海王星公转到太阳系外面的边缘处
when Neptune migrated to the outer edges of the solar system,
海王星的引力破坏了双星体系 将另一个甩出了双星系统
its gravity interfered with the double system and catapulted the other object into space,
而崔顿被海王星捕获
while Triton was forced into orbit.
这会使其他的海王星卫星的轨道发生剧烈的断裂
This would of disrupted the orbits of other Neptune moons rather violently
很大程度上推动他们远离海王星
and would most likely have either pushed them away from Neptune,
或使他们碰撞再或者与海王星相撞
or let them collide or crash into Neptune.
这个将解释为什么海王星的行星是如此受崔顿影响
This would explain why Neptune’s moons are so dominated by Triton.
但是 这将会在某一天结束
But, this will end one day,
崔顿正在放慢环绕海王星的速度
Triton is being slowed down by Neptune,
并且最终 它也会撞上海王星
and eventually, it will either crash into it,
或者由海王星的引力形成一个巨大的环形体系 类似于土星
or be ground by Neptune’s gravity into a huge ring system, similar to Saturn’s.
因此 不要关心崔顿的真实身份
So, don’t by real estate on Triton.
固定字幕由玛兹 休曼 尼尔森为你呈现–2015
Fixed English Subtiles by Mads Hagemann Nielsen – 2015
阿马拉尔·组织机构社区字幕
Subtitles by the Amara.org community

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视频概述

海王星的卫星——海卫一崔顿的发展过程及未来发展可能

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https://www.youtube.com/watch?v=cR9uphgMZ8U

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