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光的年龄 – 译学馆
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光的年龄

Age of light

从夸克到类星体-光的年龄
[music]
光既不随时间流逝 也不随距离改变
Light neither experiences the passage of time nor distance.
相对论称当物体接近光速时
Special theory of relativity states that as objects approach the speed of light,
时间就会变慢 长度也会为之缩短
time slows down and length contracts for them.
如果一直加速
As we keep increasing the speed,
时间就会变得更慢 直到速度达到光速
time further slows down until the upper limit speed of light is reached
因此当时间停止时
when time comes to a standstill
两点的间距就会变为0
and the distance between two points becomes zero.
不幸的是我们发现这不可行 因为除了光本身
Unfortunately we find this is not very practical since nothing, except light itself,
没有物体能达到光速
can attain the speed of light.
所以这说服你可能有点难
So this might be a little hard to get your head around.
让我们试试这种方法证明 μ介子是放射性粒子
Let’s try this: “Muons” are radioactive particles
它在宇宙射线和微粒在上层大气碰撞时产生
created when cosmic rays collide with molecules in upper atmosphere.
μ介子平均的存在时间只有2.2微秒
Muons have an average life span ofjust about 2.2 microseconds.
即使是以接近光速运动 它们也能
Even travelling at nearly the speed of light they should be able to cover only around
在衰变前运动660米
660 meters before they are decayed.
但是他们能以某种方式到达地球表面 运动数千公里
But somehow they do reach the surface of earth travelling thousands of kilometers.
但是这怎么可能呢?
But how can this be possible?
这就可以用时间膨胀来解释了
Here’s how it can explained using time dilation.
根据我们的理论 在地球上μ介子的运动时间减慢了
According to us, on earth, time for travelling muons has slowed down.
所以从我们的角度 它们衰变前有很多时间运动
So from our perspective, they’ve gotplenty of time before they are decayed.
从μ介子的角度 它是静止的
From the muon’s perspective, it is at rest.
但是μ介子运动几千公里实际只有660米
But it sees those thousands of kilometers as just 660 meters.
这就证明了μ介子确实经历了时间膨胀和距离缩短
This proves muons actually experience time dilation and length contraction.
光是在时间静止和距离缩短是产生的极端情况 距离变短
Light, is the extreme case where time stops ticking altogether and distance collapses onto itself.
据我们所知 光超越了空间和时间
Light transcends space and time as we know it.

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物体达到光速时会发生什么呢???

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视频来源

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