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探索“牧夫星洞” – 译学馆
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探索“牧夫星洞”

Is this really Boötes Void?

“大空隙” 一词 你可能听说过也可能没听过
You may or may not have come across the name Boötes Void in the past,
其被称作我们已知太空中最大的空隙之一
described as one of the biggest voids in space that we know of.
但它到底是什么意思呢
But what does that really mean?
先说重要的 并不是这张图
First thing’s first, it is not this image.
你用google搜一下Bootes Void 这张图会有很多
If you google Boötes Void,this image comes up a lot,
但它其实是Barnard 68号分子云
but this is actually the molecular cloud Barnard 68,
一种太空中的尘埃 阻碍其后面恒星的光透过
a cloud of dust in space that doesn’t allow light from the stars behind it to pass through,
我想它看起来像太空中的空白 但事实并非如此
which I suppose makes it look like a void in space, but it’s not in reality.
为弄清“大空隙”到底是什么 我们需要了解点东西
To understand what Boötes Void really is, we need to understand some context.
我们知道太空存在于地球之外
We know that space exists outside of Earth,
但即使处在地球大气层之外 太空还是有很多“居民”的
but even outside of Earth’s atmosphere space,is quite populated,
用天文学术语来说 你正在远眺其他诸如
and astronomically speaking, you are spitting distance from other objects like the moon,
月球 小行星 其他的行星以及太阳等物体
asteroids, other planets and the Sun.
现在你仍然可以合理地以“千米”或“英里”来丈量距离
You can still reasonably use kilometres or miles to measure distances at this point.
但在我们的太阳系之外 物体间的距离开始变得更遥远了
Outside of our solar system, objects begin to get a bit further away.
我们开始以“光年”丈量距离
We start to measure in light years at these distances,
一光年为9.46万亿千米 (5.88万亿英里)
a light year being 9.46 trillion kilometres (5.88 trillion miles).
以这样的比例来看 我们可以看见在我们的周围 存在大量的恒星
At this scale, we can see that there are plenty of stars in the near vicinity to us.
我们星系中所有的恒星构成了银河系
All the stars in our galaxy make up the Milky Way Galaxy,
直径大约150000光年的星系
a large structure roughly 150,000 ly across.
在银河系之外还有更多的星系
Beyond the Milky Way are more galaxies,
最近的仙女座在两百万光年之外
the closest big one being Andromeda at 2 million ly away.
除此之外 我们看到了星系的局部区域
Beyond that, we see the local area of galaxies that we are part of.
此刻 我最想要你关注的是
What I want you to pay most attention to at this point
星系的云集和带状分布
is the clustering and banding of the galaxies.
你会看到它们并不是均匀分布的
you’ll see that they aren’tevenly distributed.
在所有这些星系团之间都有空隙
In between all these galaxy groups are voids,
只有少量的星系点缀其间
where there are only a few galaxies dotted around the place.
它们仅仅是小空隙 直径只有数千万光年
These are just small voids, being only 10s of millions of ly across.
再一次缩小来看的话
Zooming out once more,
我们可以在广阔的宇宙中看到星带的形成
and we start to see this banding happening on a grand scale.
基于这种程度的距离
At these kind of distances,
我们可以看到宇宙像是一种
we begin to see that the universe tends to have a kind of web
由星系组成的网或纤维结构
or filament structure made of galaxies.
这些巨大的星群和“织网”间的距离
In between these huge clusters and filaments,
绵延数百万光年 被称作“超级空隙”
stretching for hundreds of millions of light years, are supervoids,
我们知道最大的空隙中的一个就是Boötes Void
one of the biggest that we know of being Boötes Void.
在三亿三千万光年的地方
At 330 million ly across,
一个典型的宇宙区间平均能发现大约2000个星系
a typical region of space would find about 2000 galaxies within that volume on average.
但这并不意味着那里就完全没有东西
But this doesn’t mean there is absolutely nothing there right now,
我们已经发现 在这个空间里有60个细丝状星系
we have discovered a very thin filament of about 60 galaxies in this void,
但它们分布稀疏
but they are so sparsely distributed
银河是否处在Boötes void的中间
that if the Milky Way was in the middle of Boötes Void,
由于距离的关系 直到20世纪60年代 我们才知道其他星系的存在
we wouldn’t have known other galaxies existed until 1960 due to the distances
所以你现在知道了 Boötes Void到底是什么:
so there you have it, that is what Boötes Void really is,
宇宙中非常空旷的空间
a very empty patch of space
处于数亿光年之外 包含一些处在较偏位置的星系
hundreds of millions of light years across, containing some very lonely galaxies.
谢谢观看
Thanks for watching!
我确实意识到 这则视频抛出了更多关于星系的问题
I do realise this video throws up a lot more questions about the universe,
诸如为什么在宇宙膨胀的过程中会出现这种星系带
like why this banding of galaxies happen about the expansion of the universe
“细丝”之外的宇宙又是什么样子的
and what the universe looks like beyond the filaments.
但是这正是宇宙的奇妙之处 每一个主题都可以引出另一个主题
But that’s the fantastic thing about space, each topic leads to another!
如果你有一个燃起宇宙的问题想寻求答案
If you have a burning space question that you’d like to have answered,
可以在下面的评论区提问
ask in the comments below.
十分感谢支持这个频道的人们
A big thank you to my Patreons who support the channel,
这次我想对David和Yulia表示谢意 他们这个月捐赠了50美元
and this time a shout out to David and Yulia who donated $50 this month!
真的很感激 非常感谢你们
I really appreciate it, thank you very much.
也十分感谢点赞和分享的人们
A big thank you as well to thoseof you that like and share,
这也大大帮助了这个频道
it really helps the channel a lot.
祝好 下次再见
All the best, and see you next time.
[音乐]
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视频概述

以星系里的距离空隙来理解“大空隙”的含义,认识宇宙的奥妙。

听录译者

收集自网络

翻译译者

爱吃柠檬的鱼

审核员

审核员 V

视频来源

https://www.youtube.com/watch?v=N7Whg14eua4

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