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So, the next step on our alien hunt is
因此，我們尋找外星人的下一步
to find a place, or places,
是找一個地方，或幾個地方
where organisms might find food and replicate and evolve.
上面的生物可以找到食物，繁衍進化
And as far as we know, that requires one thing.
我們都知道，這需要一點
Like most people, I find water both beautiful and fascinating.
和大多數人一樣，我覺得水很美很神奇
But it's also the key to all known forms of life,
同時它也是所有已知的生命形式的關鍵
from bacteria to blue whales.
從細菌到藍鯨
Find water elsewhere
如果在外星球上找到水
and aliens could exist nearby.
那附近就可能存在外星生命
The good news is that water is very common indeed out in space.
好消息是，水在外太空中確實很常見
Frozen water litters the universe,
固態水散布在整個宇宙中
from tiny, single crystals to icy comets the size of mountains.
從微小的單晶，到山那么大的冰態彗星
But to find liquid water, we need somewhere at the right temperature.
但是要想找到液態水，必須找到合適的溫度
Around every star is a region where it's
每顆恒星周圍都有一個區域
not too hot or too cold, but just right.
既不太冷也不太熱，而是剛好合適
Like the porridge in the story of goldilocks and the three bears.
像《金發姑娘與三只熊》中的麥片粥一樣
Around our sun, there are two planets
在我們太陽周圍，有兩顆行星
that lie in this "goldilocks" zone --
就位于這個"金發姑娘"地帶
the earth and Mars,
地球和火星
which is why one day I'm sure we'll pay it a visit.
因此我確信我們遲早會去拜訪火星
Robots have been exploring mars since the '70s,
從70年代開始就有機器人探索火星
but they have yet to find life.
但是它們還未發現生命
I don't think we should give up.
我不認為我們該放棄
Beneath the martian surface,
在火星表面之下
NASA's Spirit Rover discovered these white salts
美國國家宇航局的勇氣號發現了這些白鹽
which are formed in contact with liquid water.
它們的形成與液態水有關
Satellite images reveal drainage patterns
衛星照片顯示出有水系構型
and erosion of the kinds caused by rivers and oceans.
以及由河流和海洋沖蝕后的痕跡
There may well still be moisture under Mars' surface --
火星表面以下很有可能仍有液態水
moisture that perhaps could support life.
這些液態水也許足以維持生命
I hope one day we will find the money to send men and women to Mars.
我希望有一天能有足夠的資金送人們上火星
It would capture the public's imagination just as the
這足以吸引公眾的眼球
Apollo moon missions captured mine back in the '60s.
就像60年代阿波羅登月吸引我眼球一樣
