宇宙（2007）

The Universe S01E05

Part 5 April 22, 2021, 8:11 p.m.

所以当这个里面的大块与地球碰撞时,
and it happens right there,
它发生在这里,
the vast majority of the iron that came in with the impacter
大多数的铁随着碰撞
is actually accumulated by the Earth.
实际上由地球收集起来了.
While this outer clump
而外面的大块,
comes and it makes a close pass by the Earth,
靠近地球运行,
and is stripped by the Earth's gravity into a long arm of material,
在地球的引力作用下,撕开变为一条物质的长臂,
which then breaks up to form this disk.
接着破裂成为这个圆盘.
The material is taught to have coalesced to form the Moon in less than an year,
上面提到的物质紧接着沉重的撞击,
following the massive impact.
在不到一年的时间里结合形成了月球.
There is no sign of this impact on the Earth today
现在的地球上已经没有那次碰撞的痕迹,
because at the time, our planet it only developed to about 90% of its current size.
这是因为当时,地球的大小只有现在大小的90%左右.
The remaining 10% would accumulate from later much smaller impacts.
余下的10%是在以后的许多小得多的碰撞中形成的.
Also the Earth's own gravity had a reshaping effect.
地球本身的引力也重新进行了改造.
Within the day after the impact the Earth had reassumed
在发生碰撞以后的日子里,
a basically spherical shape.
地球再次形成了基本的球状.
And any depression that the impact caused
碰撞引起的所有凹地被抹平了.
would had been smoothed over.
Giant Impact theory originator Bill Hartmann
巨大碰撞理论的发明人Bill Hartmann
presented his hypothesis at a scientific conference in 1974.
在1974年的科学讨论会上介绍了他的假设.
But it received little attention for nearly a decade.
然而在近十年里,很少得到关注.
Interest in the Moon dropped off sharply at the end of the Apollo missions.
对月球的兴趣在阿波罗任务的最后急剧地降温.
Finally at a lunar conference in Hawaii in 1984
最后在1984年夏威夷的月球研讨会上,
twelve years after the last Moon shot,
距离最后一次月球发射12年以后,
the world's four most astronomers reached a consensus.
世界上最大的四个天文学组织达成一个共识.
The Giant Impact theory was the most acceptable explanation to date
巨大碰撞理论是确定月球来源
for the origin of the Moon.
最可接受的解释.
I think there's still some people who say: "Ok, it's not really proving yet."
我想还是有人会说:"好啦,至今还是没有被证明啊."
But it's what I would call the default theory.
但是这就是我称之为有待证明的理论.
If you look at any textbook of planetary science or geology
如果你翻阅所有行星科学或地质学的教科书,
it's just the theory that's accepted.
这就是公认的理论.
And there are certain small discrepancies which have yet to be explained
在已经解释的地方必然会有些小的矛盾,
but buy in large it works.
但是大部分是认可的.
Even with an agreed-upon theory of how our moon came to be
即使有一个关于月球来源的意见一致的理论,
scientists have not finished studying our closest cosmic neighbor
科学家还是没有结束用各种手段对我们最近的邻居的研究.
by any means.
In fact talk of returning to the lunar surface with a permanent end outpost
事实上讨论重返月球表面建立永久前哨基地,
has recently emanated from the Whitehouse at NASA headquarters.
最近从白宫对航♥天♥局开始了.
Gorgeous heat is at the window.
窗前灿烂的光芒.
Exec-One's good everything go.
一路顺风.
Such a base could provide a place to train astronauts to live in space long term.
这样的基地能够提供训练宇航员长♥期♥在太空生活的地方.
As well as provide them more efficient launch point for eventual missions to Mars.
以及提供更有效的发射点,最终实现火星飞行.
But such lofty scientific goals are far from the minds of average residence of Earth.
但是这崇高的科学目标是来自远方的地球的精神.
Who occasionally peer up at the glowing mesmerizing lunar disk in the night sky.
人们偶尔凝视夜晚天空生动催眠的圆月.
For us talk of lava oceans...
对于我们讨论熔岩海洋...
Regolith forming micrometeorites...
风化层形成了微小陨石...
And giant impacts...
以及巨大的碰撞...
Will never diminish the fascination and romance of our mysterious neighbor-world:
将永远不会削弱我们对那个神秘邻居的魅力与追求:
the Moon.
月球.f