# 银河会在太空中移动吗？

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“穿越空间”不是一回事。空间没有位置。运动总是相对于其他事物的，例如另一个星系，宇宙微波背景或其他。您已经收到有关相对运动的一些答案，请参见下文。
Florin Andrei

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PlasmaHH

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“从CMB数据可以看出，本地组（包括银河系的星系组）相对于CMB的参考帧（也称为CMB静止帧）似乎以627±22 km / s的速度运动，或在CMB方向上没有运动的参考系），即银河经度l = 276°±3°，b = 30°±3°。[82] [83]这种运动导致各向异性数据（CMB在移动方向上显得比在相反方向上略热）。[84]“

627 km / s相当快。看到这篇文章，说它是每小时130万英里。光速低于300,000公里/秒或6.7亿英里/小时，因此银河系以大约光速的0.2％在宇宙中移动。另请参阅ghoppe撰写的CMBR物理学答案，其中讨论了CMBR参考系，该参考系实际上是宇宙的参考系。

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“为什么移动？” 如果它完全静止，那将是一个令人难以置信的巧合。宇宙中有无数个物体在不同方向上施加引力。他们将不得不准确地平衡出星系，使其不移动。
Barmar

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@Barmar：好点。我为什么不这么说呢？！

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Mazura

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@Barmar：从“时间简史”：Newton realized that, according to his theory of gravity, the stars should attract each other, so it seemed they could not remain essentially motionless. Would they not all fall together at some point?We now know it is impossible to have an infinite static model of the universe in which gravity is always attractive.

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${}^{†}$$^\dagger$形式上，一个使用在其中的帧宇宙微波背景是各向同性的。

${}^{‡}$$^\ddagger$考虑到我们绕银河系中心的运动，我们的太阳（当前）在。$369.82±0.11\phantom{\rule{thinmathspace}{0ex}}\mathrm{k}\mathrm{m}\phantom{\rule{thinmathspace}{0ex}}{\mathrm{s}}^{-1}$$369.82\pm0.11\,\mathrm{km\, s^{-1}}$

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Mike

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@Mike这不是一个智力问题，而是一个经验和学习的问题。生活中的大多数事情都是这样。
jpmc26 2009年

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pela

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，如果不想考虑这样做。

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user230910

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Barmar

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@Barmar：两个人都以为他们是静止的，宇宙正以5 km / h的速度向他们移动，另一个人以10 km / h的速度向他们走。

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Monty Python在科学问题上似乎不太准确，但是这次在Galaxy Song中确实做得很好，还提到了银河系运动。

Just remember that you're standing on a planet that's evolving
And revolving at nine hundred miles an hour,
That's orbiting at nineteen miles a second, so it's reckoned,
A sun that is the source of all our power.
The sun and you and me and all the stars that we can see
Are moving at a million miles a day
In an outer spiral arm, at forty thousand miles an hour,
Of the galaxy we call the 'Milky Way'.
Our galaxy itself contains a hundred billion stars.
It's a hundred thousand light years side to side.
It bulges in the middle, sixteen thousand light years thick,
But out by us, it's just three thousand light years wide.
We're thirty thousand light years from galactic central point.
We go 'round every two hundred million years,
And our galaxy is only one of millions of billions
In this amazing and expanding universe.

The universe itself keeps on expanding and expanding
In all of the directions it can whizz
As fast as it can go, at the speed of light, you know,
Twelve million miles a minute, and that's the fastest speed there is.
So remember, when you're feeling very small and insecure,
How amazingly unlikely is your birth,
And pray that there's intelligent life somewhere up in space,
'Cause there's bugger all down here on Earth.


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“距银河系中心点三万光年。我们每两亿年绕一圈”，对于“银河系正在移动”的主题，恕我直言，恕我直言
Ole Albers

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Barmar