宇宙（2007）

The Universe S02E14

Part 6 April 23, 2021, 10:07 a.m.

through the magnetic fieldsof the pulsar.
经过脉冲星的磁场所致
But there is morethan blue glow.
然而不止是发出蓝♥光♥
Recent space photos revealthat the magnetic fields...
最近的太空照片显示那个磁场
are stirring upthe center of the nebula.
正在星云中♥央♥搅动
You see little ripplesemanating out from the pulsar.
你可以看到脉冲星传出的涟漪
lt's not a bad analogy...
不错的比喻是
to think of magnetic fieldsas stretched rubber bands...
把磁场比作拉长的橡皮圈
and when you pluck them...
你拉它时
you cause a disturbancethat works its way through them.
会引起扰动它只管前行
And that's what's goingon somehow or another.
不知怎么回事一路往前
The details are beyond us.
细节超乎想象
But we can see the phenomenon,and it's quite clear.
但是我们能看到现象非常清晰
The death ofthe starthat formed the Crab Nebula...
形成蟹状星云的恒星的死亡
is part of the life cycleof the galaxy.
是星系生命周期的组成部分
The gas expelled into space...
气体排入太空
as supernova remnantsand planetary nebulas...
成为了超新星残骸和行星状星云
returnsto the interstellar medium...
又回到了星际介质
where it becomes raw materialfor future generations of stars.
成为了新一代恒星的原料
This processcannot go on forever...
这个过程不能永远持续下去
because we have a finiteamount of hydrogen gas.
因为氢气量有限
Sooner or later, you use upmost of the hydrogen and helium...
迟早会耗尽点亮星星使之闪烁的氢和氦
which light up the stars,and the stars blink out.
When you lookat the Milky Way today...
你现在看到的银河系
97%的物质在恒星里
ninety-seven percentof its mass is in stars...
3%在气体中
three percent is left in gas.
And as starformation proceeds...
在恒星形成的过程中
that reservoir is going to godown and down and down.
蓄水池在不断地降低
Certainly, starformationwill slow down because this gas...
当然恒星形成会放慢因为气体
isjust harder to get outof the ground, as it were.
很难离开那个范围姑且这样说吧
But astronomers, usingthe Green Bank Radio Telescope...
然而天文学家利用绿岸射电望远镜
have recently discoveredone source of gas...
最近发现了一个气源
in a massive cloudoutside the Milky Way.
就在银河系外的大团星云里
The very interesting thingabout this cloud...
有趣的是这个星云
which has beencalled Smith's Cloud...
被称为史密斯云
is that it's very massive.
非常庞大
lt's got about a million times the massofthe Sun in it of gas and dust.
其中的气体尘埃是太阳质量的100万倍
Well, this cloud is headedright toward the Milky Way.
现在这个星云正冲着银河系而来
And in 20 to 40 million years,it's going to collide with us.
在2000到4000万年里它将会于我们相撞
Now, that's going to createa pressure, a shockwave.
会产生压力冲击波
And it may set off a generationof hundreds of new stars...
在它碰撞银河系时
when it collideswith the Milky Way.
可能引出数百颗新一代新星
As the gas in Smith's Cloudis compressed by the collision...
由于史密斯云里的气体在碰撞中被压缩
a brand-new star-forming nebulawill light up the galaxy...
全新的产星星云将点亮星系
and the lifecycleof the universe will continue.
宇宙的生命周期将得以延续
ln the long term, however, therearen't enough Smith's Clouds...00:43:25,894 -- 00:4327,937to keep the process going...
从长远来看不管怎样没有足够的史密斯云
来维持这个过程的继续
and nebulaswill gradually disappear.
星云将会逐渐消失
The universe is about14 billion years old...
宇宙已有约140亿岁了
1000亿年后回看银河系
and come backin a hundred billion years...
and look at the Milky Way...
the big, bright, massive starscan't form anymore.
巨大明亮的恒星将不可能再形成了
All that's left arethe ancient remnants of stars...
留下的只是古老的恒星残骸
that formed in the long past.
那是很久以前所形成的
lt's a dull place,a very dull place.
是个沉闷之地乏味之地
We live in an exciting timein the era of the universe...
我们生活在宇宙岁月中一段激动人心的时段里
before stars burn out...
恒星尚未燃尽
and the reservoirof new material is gone...
形成新恒星和行星的新材料水库尚未干涸
for formingnew stars and planets.
lt's a privileged time.
这是个优越的时段
A time when the skystill remains filled...
这个时段天空依然充满着光辉
with the lightsof the great Orion Nebula...
有大猎户星云
the Pillars of Creation...
创造之柱
and the Eye of God...
上帝之眼
each onea small marvel of nature...
大自然的每一个小奇迹
in the vast expanseofthe universe.
存在于广袤的宇宙间
最后找上裸♥露♥的质子