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Get it right, and the ship would be pulled into orbit,
如果一切正常，宇宙飛船就會進入
a giant circle 30 million miles in diameter.
一個直徑為3000萬英里的巨型圓軌道
Here it would be safe.
在這里它就安全了
Its speed would be enough to keep it from falling any further in.
它的速度足以避免其墜入黑洞
If a space agency were controlling the mission from earth or
如果某航天局從地球或其他任何
anywhere else far away from the black hole,
遠離該黑洞的地方遠程操控該任務
they'd observe that each full orbit took 16 minutes.
會發現飛船沿軌道運行一周需16分鐘
But for the brave people on board,
但是對于飛船上勇敢的宇航員
close to this massive object,
由于接近質量巨大的物體
time would be slowed down.
時間將會減慢
And here the effect would be far more extreme than
而這一位置上的減慢效果遠比
near the pyramid or planet earth.
在金字塔或地球附近顯著
The crew's time would be slowed down by half.
宇航員的時間將減慢一半
For every 16-minute orbit,
每16分鐘的軌道運行
they'd only experience 8 minutes of time.
他們實際只需用8分鐘時間
Round and round they'd go,
一圈又一圈
experiencing just half the time of
宇航員度過的時間
everyone far away from the black hole.
只有遠離黑洞人們的一半
The ship and its crew would be traveling through time.
飛船將載著宇航員在時間中穿行
Imagine they circle the black hole for 5 of their years,
試想宇航員繞著黑洞轉了5年
10 years would pass elsewhere.
相當于地球上過了10年
When they got home,
他們返航時
everyone on earth would have aged 5 years more than they had.
地球上所有人的年齡都比他們多增長5歲
The crew of the spacecraft would return to a future earth.
宇航員們回到的是未來的地球
They would have made a journey not only in space, but in time.
他們應該經歷了一段空間更是時間的旅行
So a supermassive black hole is a time machine.
因此特大質量黑洞就是一個時間機器
But of course it's not exactly practical.
當然，這并不完全可行
It has advantages over wormholes in that it doesn't provoke paradoxes.
它優于蟲洞的地方是不會產生悖論
Plus it won't destroy itself in a flash of feedback.
并且不會在反饋瞬間摧毀自身
But it's pretty dangerous.
但它仍然非常危險
It's a long way away.
行路迢迢
And it doesn't even take us very far into the future.
而且也不能將我們帶入非常久遠的未來
