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Fortunately, there is another way to travel in time,
所幸還有另外一種穿越時間的方法
and this represents our last and best
它是我們建造真正時間機器的
hope of building a real time machine.
最后也是最有望實現的一絲希望
Traveling through the fourth dimension
通過第四維空間進行時間旅行
will never be a walk in the park.
永遠不會像在公園散步那么簡單
But it turns out there is a surprisingly
但事實上存在一個驚人的
straightforward way to do it.
直通途徑
You just have to travel very very fast,
你只需以極快極快的速度移動
much faster than even the high speed required
甚至要快于能夠
to keep out of the supermassive black hole.
避免被吸入特大質量黑洞的高速度
This is because of another strange fact about the universe.
其中的奧妙在于另一個奇妙的宇宙事實
There's a cosmic speed limit --
世界上存在宇宙速度極限
186,000 miles per second,
186000英里/秒
also known as the speed of light.
即人們熟知的光速
Nothing can exceed that speed.
這是世間最快的速度
I realize this sounds weird, but trust me.
我知道這聽起來有些奇怪，但請相信我
It's one of the best established principles in science.
這是最具權威的科學定理之一
Believe it or not,
信不信由你
traveling at near the speed of light
以接近光速的速度移動
transports you to the future.
你就能穿越至未來
To explain why,
為弄清原委
let's dream up a science-fiction transportation system.
我們來想象一個科幻的運輸系統
Imagine a track that goes right around the earth.
試想有一條緊繞地球的軌道
A track for a superfast train.
一條極速列車專用軌道
We're going to use this imaginary train to get as close as possible
假定這列虛幻列車無限接近光速
to the speed of light and see how it becomes a time machine.
看它如何變成時間機器
On board are passengers with a one-way ticket to the future.
列車上的乘客手持通向未來的單程票
The train begins to accelerate faster and faster.
列車開始不斷加速，越來越快
Soon it's circling the earth over and over again.
很快它便開始一圈又一圈繞地球行駛
To approach the speed of light means circling the earth pretty fast.
無限接近光速意味著飛速環繞地球
Seven times a second.
達到每秒7圈
