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But the faster you go, the more time dilates.
但是行駛的速度越快，時間的膨脹越多。
For astronauts orbiting the Earth for 800 days, it starts to add up.
如果宇航員們環繞地球800天，其影響就會明顯。
But what affects humans also affects machines.
言而，影響人類的也會影響機器。
Satellites of the global positioning system are also hurdling around the Earth at thousands of miles an hour.
GPS的衛星同時也環繞著地球行駛，且速度為每小時數千英里。
So, time dilation kicks in here, too.
因此，時間在這情況也顯見膨脹的。
In fact, their speed causes the atomic clocks on board to disagree with clocks on the ground by seven millionths of a second daily.
事實上，GPS衛星的行駛速度導致飛行著的原子鐘與地上的原子鐘之間產生每天7百萬分之一秒之差。
Left uncorrected, this would cause GPS to lose accuracy by a few kilometers each day.
如果再不做校對的話，這將會令GPS失去準確性且產生每天幾公里差異。
So, what does all this have to do with time travel to the far, distant future?
那么，這些和穿越時空和去遙遠的未來有什么關系呢？
Well, the faster you go, the greater the effect of time dilation.
當行駛的速度越快，時間膨脹的效應越大。
If you could travel really close to the speed of light, say 99.9999%,
如果你行駛的速度真的能夠接近光速的話，比方說，百分之99.9999，
on a round-trip through space for what seemed to you like ten years,
繞太空來回一圈，對你來說可能像過了10年，
you'd actually return to Earth around the year 9000.
但是當你回到地球時，將會是9000那年左右。
Who knows what you'd see when you returned? !
到那時候誰知道你回來后會看到什么？
Humanity merged with machines, extinct due to climate change or asteroid impact, or inhabiting a permanent colony on Mars.
人類與機器分不開，源于全球暖化或行星之間撞擊的滅絕，又或是人類在火星定居了。
But the trouble is, getting heavy things like people, not to mention space ships,
但問題是，要把像人一樣那么重的東西，莫說太空飛船了，
up to such speeds requires unimaginable amounts of energy.
移動到達接近光速般，是需要不能想象的巨大能量。
It already takes enormous particle accelerators like the Large Hadron Collider to accelerate tiny subatomic particles to close to light speed.
大量的粒子加速器如大型粒子對撞機被需要來把微小的亞原子粒子加速以接近光速。
But one day, if we can develop the tools to accelerate ourselves to similar speeds,
但是終有一天，如果我們能夠發明一些工具可以讓我們加速到如光速度般，
then we may regularly send time travelers into the future, bringing with them tales of a long, forgotten past.
到那時候，我們可能隨時可以把穿越時空者送到遙遠的未來，還有帶著我們古老，被遺忘的故事去。
