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Get it right, and the ship would be pulled into orbit,
如果一切正常，宇宙飞船就会进入
a giant circle 30 million miles in diameter.
一个直径为3000万英里的巨型圆轨道
Here it would be safe.
在这里它就安全了
Its speed would be enough to keep it from falling any further in.
它的速度足以避免其坠入黑洞
If a space agency were controlling the mission from earth or
如果某航天局从地球或其他任何
anywhere else far away from the black hole,
远离该黑洞的地方远程操控该任务
they'd observe that each full orbit took 16 minutes.
会发现飞船沿轨道运行一周需16分钟
But for the brave people on board,
但是对于飞船上勇敢的宇航员
close to this massive object,
由于接近质量巨大的物体
time would be slowed down.
时间将会减慢
And here the effect would be far more extreme than
而这一位置上的减慢效果远比
near the pyramid or planet earth.
在金字塔或地球附近显著
The crew's time would be slowed down by half.
宇航员的时间将减慢一半
For every 16-minute orbit,
每16分钟的轨道运行
they'd only experience 8 minutes of time.
他们实际只需用8分钟时间
Round and round they'd go,
一圈又一圈
experiencing just half the time of
宇航员度过的时间
everyone far away from the black hole.
只有远离黑洞人们的一半
The ship and its crew would be traveling through time.
飞船将载着宇航员在时间中穿行
Imagine they circle the black hole for 5 of their years,
试想宇航员绕着黑洞转了5年
10 years would pass elsewhere.
相当于地球上过了10年
When they got home,
他们返航时
everyone on earth would have aged 5 years more than they had.
地球上所有人的年龄都比他们多增长5岁
The crew of the spacecraft would return to a future earth.
宇航员们回到的是未来的地球
They would have made a journey not only in space, but in time.
他们应该经历了一段空间更是时间的旅行
So a supermassive black hole is a time machine.
因此特大质量黑洞就是一个时间机器
But of course it's not exactly practical.
当然，这并不完全可行
It has advantages over wormholes in that it doesn't provoke paradoxes.
它优于虫洞的地方是不会产生悖论
Plus it won't destroy itself in a flash of feedback.
并且不会在反馈瞬间摧毁自身
But it's pretty dangerous.
但它仍然非常危险
It's a long way away.
行路迢迢
And it doesn't even take us very far into the future.
而且也不能将我们带入非常久远的未来
