宇宙（2007）

The Universe S01E01

Part 6 April 22, 2021, 8:09 p.m.

as it moves along the earth's surface,
当它沿着地球表面移♥动♥时,
then you'll see only a partial eclipse.
你就只能看到日偏食.
But travel to a spot within the path of the dark inner shadow,
然而进到里面黑影的部分,
called the umbra,
叫做本影,
and you'll experience the majesty of a total eclipse.
你将体验到日全食的雄伟.
There's another option if you can't travel to the path of totality,
假如你无法去日食发生的地方，还有一个选择，
wait in one place long enough
那就在一个地方等足够的时间，
and a total eclipse will pass right over your head
日全食会正好在你的头顶上的，
about once every 300 years.
大约每300年一次.
The Sun, that shining star of our solar system
太阳，我们太阳系的最明亮的恒星，
is capable of both astonishing beauty and ferocious violence.
即出奇的美丽，但又是极度的残暴.
It seems impossible to believe,
似乎无法使人相信,
but it won't be around forever.
它不会永恒生存.
Eventually even the sun must die.
最终连太阳也必然死亡.
The sun has a fixed amount of fuel in its core,
太阳核的燃料数量是固定的,
it is undergoing fusion, at a rate that you can calculate.
经过燃烧,其速度是可以计算出来的.
So here's the rate it's using its fuel,
有太阳使用燃料的速度,
here's how much fuel you have,
有多少燃料,
so it's a simple calculation to show when the sun will die,
通过简单的计算就可以表明太阳什么时候会死亡,
and that's in about a five billion years.
大概会在50亿年左右.
Well, unfortunately the sun will not go out with a bang.
是的,可惜太阳不会在大爆♥炸♥中走完一生.
It's too small to erupt in a supernova.
它太小了,不会象超新星那样喷发.
However stars do a peculiar thing,
不管怎样,太阳会发生特别的情况,
the one of the few things around that get hotter as they cool off.
最有可能是随着冷却,会趋于白热.
As it exausts its hydrogen fuel our nearest star will cool
随着氢燃料的用尽,我们亲密的太阳会变冷,
and gradually collapse under the force of gravity.
在引力作用下逐渐崩塌.
Energy from this collapse will start heating up the core again
崩塌产生的能量会再次加热日核
to hundreds of millions of degrees, hot enough to start burning helium.
到数亿度,足够的温度开始使氦燃烧.
Onto the extraheat of the helium burning
在氦燃烧额外的加热中,
the star will expand into a monstrous orb called a red giant.
太阳将膨胀成巨大的天体,称为红巨星.
It'll get so big it will engulf
它是如此的庞大,会吞没
the entire orbits of Mercury, Venus and Earth.
整个水星,金星和地球的轨道.
You don't want to be around for that.
不可能再围绕着它.
You'd wanna be **climbed** upping your way to safety,
你会希望"攀升",提升你的安全,
long before this happens.
在此发生之前.
The earth is likely to change it's orbit slightly as the star expands,
在太阳膨胀时,地球会稍微改变它的轨道,
so that we won't be engulfed.
所以我们不会被吞没.
Still, talking about global warming, you wouldn't want to be here.
但是,在讨论全球变暖时,你不会想到这.
The outer layers of our sun will eventually become so unstable
太阳的外层会变得不稳定,
that they will fly off into space,
会飞进太空,
leaving behind a small core about the size of the earth.
离开地球大小的日核.
So now will be shrunk most of the sun,
太阳的大部分会收缩,
which is a million miles across to the size of the earth which is
一百万英里直径缩小到象地球
well like 6000 miles across.
那样6000英里直径大小.
Our once great star reduced to a slowly cooling cinder.
我们过去伟大的太阳慢慢地冷却为余烬.
Life as we know it on earth will cease to exist.
生命,如地球上的,将终止生存.
And that was the death of the sun.
那就是太阳的末日.
All of this is bad news for the human race,
所有这些对人类是个厄耗,
but look on the bright side.
然而来看看光明的一面.
We've got five billion years to repair for this disaster.
我们会有50亿年对这个灾难进行补救.
For now, humanity basks in the glow of a sun
现在,人类沐浴在
in the prime of its life.
中年期的太阳辉光中.
Science has uncovered many of the secrets of our nearest star,
科学家发现了我们最亲密的恒星的许多秘密,
but we remain awed by its beauty,
但是我们依然保持着对它的敬畏,
and ever more wary of its wrath.
而且比以往更多地警惕它的发威.
火星表面没有外星人的遗迹.火星探索将在"宇宙"节目的下周播出.
This face on Mars is not an alien monumentExplore Mars in "The universe" next week.