ADM-201 dump PMP dumps pdf SSCP exam materials CBAP exam sample questions

银河系与仙女座的大碰撞 – 译学馆
未登录,请登录后再发表信息
最新评论 (0)
播放视频

银河系与仙女座的大碰撞

Milky Way Versus Andromeda As Seen from Earth

天文学家借助哈勃望远镜
Astronomers have used the Hubble Space Telescope
预测了一场未来的宇宙碰撞
to forecast a future cosmic pile up.
一场大约会在四十亿年内
the titanic collision of the Milky Way and the Andromeda galaxy
发生在银河和仙女座之间的巨大碰撞
in about four billion years time.
大约两百二十万光年以外的仙女座星系
The Andromeda Galaxy some 2.2 million light-years away.
是离地球所在银河系最近的螺旋型星系
is the closest spiral galaxy to our home, the Milky Way.
近一个世纪以来 天文学家发现它正朝我们移动
For around a century astronomers have known it is moving towards us.
但这两个星系是会相撞
but whether or not the two galaxies would actually collide
还是简单地擦身而过 尚未得知
or simply fly past each other, remained unclear.
目前 一组天文学家通过借助哈勃太空望远镜
Now, a team of astronomers has used the Hubble Space Telescope
观察仙女座星系中星星的移动
to shed light on this question.
来阐明了这个问题
By looking at the motion stars in the Andromeda Galaxy.
我们想搞清楚仙女座如何在宇宙中移动
Ok, we wanted to figure out how Andromeda was moving through space.
为此我们测量了
So in order to do that
仙女座星星相对背景星系下所在的位置
we measured the location of the Andromeda stars relative to the background galaxies.
2002年 它们在一个位置
In 2002 they were in one place
2010年 它们在一个些微不同的位置
and in 2010 they were in a slightly different place.
这让我们能测量仙女座星星八年来的移动
And that allowed us to measure the motion over a period of eight years.
这些运动实际上非常得精妙 人眼很难察觉
The motion is actually incredibly subtle, and not obvious to the human eye.
即使是通过哈勃精密的图像也不行
Even when looking at Hubble’s sharp images.
然而 精密的图像分析显示出微小的运动轨迹
However, sophisticated image analysis revealed tiny movements.
这使科学家能够预测未来
That the scientists were able to project into the future.
基于这些发现 最终可能展现出
Based on these findings, it is finally possible to show
银河系在接下来的八十亿年内会发生什么
what will happen to the Milky Way over the next eight billion years.
随着星系漂移得更近
As the galaxies drift closer,
然后碰撞 并逐渐合并成
and then collide and gradually merge into
一个单独的 更大的淡红色的椭圆星系
a single, larger, elliptical galaxy with reddish stars.
并且太阳系肯定将会在这场大碰撞中幸存
And yet the Solar System should in fact survive this huge crash.
目前我们认为太阳系
Now the reason we think that
不会被这场银河系和仙女座之间
our Solar System will not be much affected by this collision
的碰撞影响的原因是
between the Milky Way and Andromeda
星系中大多为空旷的空间
is that galaxies are actually mostly empty space.
即使我们的银河系如同仙女座星系一样
Even though our galaxy is really seem as Andromeda as
其中有上千亿颗星星
There’s hundreds of billion stars in it.
这些星星相离得很远
They are very far of apart.
如果两个星系真的相撞
So if two galaxies actually collide with each other,
星星们主要是相互擦身而过
the stars basically pass right between each other
两个星星会直接相撞的几率非常非常小
and the chance of two stars directly hitting each other is really, really small.
所以我们的太阳系会和另一星球直接相撞的几率
So the likelihood that our Solar System will be directly impacted by another star,
比如 在仙女座内和一颗星球相撞的几率 其实非常非常小
for example, in Andromeda, as we collide with it, is really really small.
如果这种碰撞发生时 地球上仍有生命
Well, if life is still present on Earth when this happens,
那么天空中将会出现非常壮观的景象
the changes in the sky will be quite spectacular.
过程会更慢很慢
Now they will be very very slow.
因为相对于宇宙星系的时间单位非常非常长
Because the timescales on the scales of galaxies in the Universe are very very long.
你可以想象 数百万年的时光
So you have to think, millions of years.
但是即使按照百万年为量程来计算时间 我们仍然能看到巨大的变化
But even then over these timescales over millions of years, we will see big changes.
如果我们等待数亿年 仙女座从天空中看将会变得巨大
If we wait a few billion years, Andromeda will be huge on the sky.
它会变得和银河一样大 因为它离我们更近了
It will be as big as our Milky Way becausewe’ll be very close to it.
接着 随着星系间的合并
And then later, when the galaxies merge,
银河系和仙女座星系合并后的产物
the merged remnant of the Milky Way Galaxy and Andromeda
会看起来更像一个椭圆星系 而我们身处其中
will look more like an elliptical galaxy and we’ll be sitting right in it.
届时夜空中银河的景象将会完全消失
So the view of the Milky Way on the nightsky will be completely gone.
带状光线会被球状分布的光线所代替
and this band of light will be replaced by a more spheroidal distribution of light.
自此 五十亿年前诞生于银河系的太阳
And so, the Sun born in the Milky Way almost 5 billion years ago,
会作为一个新星系的一部分 在新的轨道终结自己的生命
will end its life in a new orbit, as part of a new galaxy.

发表评论

译制信息
视频概述

银河系与仙女座之间的大碰撞将发生在40亿年以内,地球是否会受到影响,在视频中找寻答案吧。

听录译者

收集自网络

翻译译者

别滋米

审核员

YF

视频来源

https://www.youtube.com/watch?v=qnYCpQyRp-4

相关推荐