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宇宙能变成白色的吗? – 译学馆
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宇宙能变成白色的吗?

What If the Universe Was White Instead of Black?

假如宇宙是白色的?
If the Universe is full of stars,
如果宇宙中充满了闪烁的星星
why doesn’t it appear white?
那它为什么不是白色的呢?
And if it did, what would it look like?
如果它是 又会成为什么样子?
Will all the black holes suddenly become visible?
所有黑洞会突然变得可见吗?
if our sky was all white
如果我们的天空都是白色的
would we still be able to see the stars
我们还能看见星星吗?
This is WHAT IF,
欢迎收看《自然无常》
and here’s what would happen
本期我们将讲述
if the Universe was white instead of black.
如果宇宙由白色代替了黑色会怎样
Let me break something to you.
让我给你解释一下
Black is not a color
在物理学中
as far as physics is concerned.
黑色并不是一种颜色
By definition, color is the visible spectrum of light waves.
根据定义 颜色是光波的可见光谱
A black object absorbs all the colors in the spectrum,
黑色的物体可以吸收光谱中的所有颜色
making “black” an absence of any colors
使得“黑色”之中没有颜色
On the other hand, “white” is a mixture of all colors,
与之相对 “白色” 是所有颜色的混合
and it contains all wavelengths of visible light.
它包含了所有波长的可见光
Color is about our sensory perception of the world.
色彩是我们对世界的一种感知
But going back to the background of the Universe,
但追溯宇宙的发展背景
you could say it was white once.
你们就可以说宇宙曾一度是白色的
When the Universe was born from the Big Bang,
在宇宙从大爆炸诞生之际
it didn’t have any stars to emit light.
那时候没有任何星星释放光芒
It was opaque with a hot soup
宇宙就好像一大锅浑浊的汤
of protons, electrons and neutrons.
质子 电子和中子杂乱无章地混合在其中
After about 300,000 years, space cooled down
大约30万年以后 宇宙慢慢冷却下来
and those particles began pairing up
不同粒子之间开始相互配对
into atoms and molecules
合并成原子和分子
The Universe became transparent.
宇宙开始变得透明了
But to you, it would appear absolutely dark.
但是对于我们而言 宇宙还是一片黑暗
Because not a single light source had formed yet.
因为此时的宇宙还没有形成单个光源
This was the era of cosmic dark ages.
这就是宇宙的“黑暗时代”
It ended when the first stars started fusing hydrogen into helium.
当第一批恒星将氢融合为氦时 黑暗时代结束了
Those stars were up to 300 times more massive than our Sun,
这一时期形成的恒星的质量是太阳的300倍
and a million times brighter.
其亮度则约为太阳的100万倍
They shined for a few million years
在闪耀了几百万年后
before they exploded as supernovas.
它们最终爆发成为一颗超新星
The growing radiation from the those first stars
随着初代恒星发出的辐射越来越大
ionized hydrogen atoms -split them back into protons and electrons.
电离的氢原子再次被分解为质子和电子
That’s when the dark Universe lit up,
黑暗的宇宙第一次开始发光
filled with ultraviolet protons.
宇宙中充满了紫外线质子
So, why didn’t it stay that way?
为什么宇宙无法保持这个样子?
Why with all the new stars and new galaxies,
为什么随着所有新恒星和新星系的诞生
is our night sky no longer bright?
我们的夜空却不再明亮?
That is OLBERS’ PARADOX
这就是“奥尔伯斯悖论”
You see, if the Universe appeared to be white instead of black,
假如一个宇宙呈现白色 而非黑色
it would mean that it’s infinitely old,
这意味着这个宇宙相当古老
infinitely big and static at the same time.
相当巨大 且同时处于静态之中
That would make it a different Universe altogether.
从而使得现在的宇宙完全变成另一个样子
We know that our Universe is just under 14 billion years old.
我们知道 宇宙目前还不到140亿岁
That might seem like a long time, but remember,
这听起来似乎很长 但不要忘了
even light has its speed limit.
即使是光也有它的速度限制
We can only see stars that are less than 14 billion light years away from us.
我们只能看到距离我们不到140亿光年的恒星
The light from more distant stars
来自更遥远恒星的光
hasn’t had the time to reach Earth yet.
至今还未到达地球
As our Universe keeps expanding,
随着宇宙的不断膨胀
the distance between stars is increasing, too.
恒星之间的距离也在不断增加
And as distant stars move further away from us,
当遥远的恒星离我们越来越远时
the wavelength of their light increases and shifts towards red.
它们的光波波长逐渐增加 并发会生红移现象
Until it becomes so long
直到光波变得足够长
that the human eye can’t see it anymore.
使得人眼再也无法看见这些恒星
That’s another reason for the black background of the Universe.
这也是宇宙背景呈现黑色的另一个原因
Space is filled with all kinds of radiation,
宇宙空间充满了各种各样的辐射
you just can’t see it.
只是我们无法看见而已
And what about the black holes?
那么黑洞呢?
Well, even if a very powerful source of light illuminated our Universe,
即使用一个非常强大的光源照亮宇宙
you still wouldn’t see any black holes.
你仍然无法看到任何黑洞
Those things have such a strong gravity,
因为黑洞的引力非常强大
that they don’t emit any light,
它们不会发出任何光
and therefore can never be visible.
因此 人们永远无法看见它
Black is, after all, an absence of color.
毕竟 黑色是没有颜色的
It would be cool to catch a black hole one day
有朝一日捕获一个黑洞
and turn it into an infinite energy source.
并将其转化为无限能源将是很酷的一件事
But that’s a story for another WHAT IF.
那就是《自然无常》所要讲述的另一个故事

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视频概述

宇宙知识科普,关于宇宙是黑色的原因,以及黑洞等知识。

听录译者

收集自网络

翻译译者

三顷

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审核员SR

视频来源

https://www.youtube.com/watch?v=TM1_rnoyxv4

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