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宇宙解密 S1 • E5 我们是否扩张了宇宙? – 译学馆
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宇宙解密 S1 • E5 我们是否扩张了宇宙?

Do We Expand With The Universe?

物理学家告诉我们宇宙正在膨胀 但那是否意味我们也随着膨胀而变化呢
Physicists tell us that the universe is expanding, but does that mean we expand with it?
我的意思是 如果是这样 那么肯定没人注意到因为每个物体都按相同比例放大了
I mean, if so, wouldn’t no one notice because everything would scale up at the same relative
就像什么都没发生一样?
size and it would seem like nothing had changed?
事实是 宇宙并没有扩增
Well, the truth is, the universe isn’t expanding.
而空间在扩增
Space is.
当然 宇宙中的所有东西都在“空间”范围内
Of course, everything else in the universe is “in” space, and ignoring the influence
忽略其他因素 当物体之间的空间扩大
of any other forces, when the space between things expands, those things will appear to
这些物体之间的距离似乎变得更大
be carried farther apart.
但宇宙中确实存在其他力量 并且空间扩增
But there are other forces in the universe, and their strengths aren’t directly affected
对它们并无影响
when space expands.
例如 引力和电磁场可以将原子和太阳系聚到一起
For example, gravity and electromagnetism are able to hold atoms and solar systems together
因为它们的力量强大到空间的缓慢扩增无法抵消
because these forces are too strong for the slow expansion of space to overcome.
想象一下 你和你的猫咪水平站在一块地上
Think of it like this – if you and your cat are standing on a piece of ground that starts
地面水平延长 就会使你和你的猫咪
to stretch horizontally between you, the ground will pull you and your cat away from each
互相远离
other.
但如果束缚力足够强 尤其是当大于脚底
But if the leash is strong enough – in particular, if it’s stronger than the friction force between
和地面的摩擦力时 你和猫之间的距离
your feet and the ground – it’ll hold you and your cat together as space expands beneath
就保持不变
you.
在真实宇宙中 是电磁场的强度决定了
In the real universe, it’s the strength of the electromagnetic force that determines
粒子 原子 分子的有效粒径 因此即使它们所在的
the effective sizes of particles, atoms, and molecules so that even if the space they’re
空间扩增 分子也不会发生变化
in expands, the molecules don’t.
电磁场就是使原子和分子成为整体的束缚力
Electromagnetism is basically the leash that holds atoms and molecules together – and gravity
引力就是使太阳系和银河系成为整体的束缚力
is the leash that holds solar systems and galaxies together.
只有距离超级无敌远时 引力才会足够弱
Only over super super long distances is gravity’s attraction weak enough and the cumulative
累积的空间扩增才会使星系和星系团
expansion of all that space big enough to cause galaxies and galactic clusters to actually
之间的距离随着时间累积而真正变远 我们知道这些是因为
grow more distant from one another over time – we know this because the light from distant
遥远星系发出的光在空间里传播 随着空间的不断扩增
galaxies gets red-shifted as it’s stretched by the expansion of the space it’s traveling
而转变为红光
through.
引力当然还是吸引遥远物体相互靠近 但是空间扩增地更快
Gravity certainly still pulls distant objects towards each other, but space expands faster.
也就是 猫咪脱了绳索
Basically, the cat is off the leash.
本次《分钟物理》视频由audible.com支持
This episode of Minute Physics is supported by audible.com,
各种有声书的领先提供者 包括各类文学
the leading provider of audiobooks across all types of literature including
小说 非小说 以及期刊
fiction and nonfiction and periodicals.
史蒂芬·霍金的《时间简史》是关于宇宙历史的
A Brief History of Time by Stephen Hawking is an excellent and time-tested book about
杰出著作 久经时间考验
well, the history of the universe where
书中阐明人类从哪里来 将要到哪里去这类问题
where we all come from where we’re going and so forth.
你懂得 应该都是你会感兴趣的问题
you know, things you might be curious about.
在audible.com/minutephysics上免费下载此次或其他你想要的视频
You can download this audiobook or another of your choice for free at audible.com/minutephysics.
再次感谢audible.com使我制作
Again thanks to audible for making it possible for me to keep
《分钟物理》视频变为可能 想要免费有声书 就去audible网站吧!
producing minute physics, and for giving you a free audiobook at audible com/minutephysics.

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视频概述

宇宙在缓慢扩增,如果扩增到大于星球之间的引力,会发生什么呢?

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收集自网络

翻译译者

海参崴

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审核团MG

视频来源

https://www.youtube.com/watch?v=th_9ZR2I0_w

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