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Could there be extraterrestrial life here?
那里有外星生物吗？
Are we ready to rewrite the history books, to tear up the science books
我们准备好改写史书，撕毁科学书籍
to turn our world upside down?
颠覆我们的世界了吗？
What happens next could change everything
接下来发生的可能会改变一切
Mars is the planet that most captures our imagination.
火星比任何其他行星都能激发我们的遐想
Think of B-movies, sci-fi comics, what follows?
想到科幻电影、漫画，你会联想到什么-
Martians?
火星人？
It's all just fiction, right?
这都是虚构的，对吗？
But what it there really is something here?
但如果这里真的有生物呢？
Hard to imagine, though. Up close, this is a dead planet
无法想像，近观火星是一个死去的行星
The activity that makes the Earth livable shut down millions of years ago here
使得地球适宜居住的演化过程几亿年前在火星上就停止了
Red and dead
红色、死寂
Mars is a giant fossil.
火星是一块巨大的化石
Wait. Something is alive
等一下，还有东西在活动
A dust devil, a big one
一个巨大的尘暴
Bigger than the biggest twisters back home.
绝对超过地球上最大的龙卷风
There's wind here
这里有风
And where there's wind, there's air
有风说明有空气
Could that air sustain extraterrestrial life?
可以维持外星生物的空气
It's too thin tor us to breathe.
但对我们的呼吸来说，火星的空气太稀薄了
And there's no ozone layer
而且这里没有臭氧层
Nothing to protect us against the Sun's ultraviolet rays.
没有什么能够保护其不受太阳紫外线的伤害
There is water
这里有水
But frigid temperatures keep it in a constant deep freeze
但在彻骨的严寒中只能永远被冰冻
It's hard to believe anything could live here
很难相信有什么可以在这里生存
Back on Earth, there are creatures that survive in extreme cold, heat
但是在地球，极冷和极热的地方都有生物存在
even in the deepest ocean trenches
即使在最深的海沟
It's as though life is a virus.
生命好像病毒
It adapts, spreads
会适应环境、会散播
Maybe that's what we're doing right now
也许我们现在正在携带着
carrying the virus of life across the universe.
生命的病毒穿越宇宙
Even in the most extreme conditions life usually finds a way.
即使在最极端的环境里，生命都会找到生存的办法
But on a dead planet?
但在这个死去的行星上
With no way to replenish its soil, no heat to melt its frozen water?
没有活动去补充它土壤中的成分，没有热量使其冰冻水融化
All this dust, it's hard to see where we're going
还有大量尘埃，让我们无法辨别方位
