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A quarter of a million miles up is the earth's last hope of defense.
在25萬英里高空，是保衛地球的最后希望。
The Moon has saved the planet before.
月球曾經拯救過地球。
Its pockmarked surface bears the scars of countless collisions.
它千瘡百孔的表面上留有無數次碰撞留下的傷痕。
This crater, known as Tycho, is more than 50 miles wide, created by a rock only half the size of the one that's on its way.
這個被稱為第谷(Tycho)的隕石坑寬50多英里，由一塊只有正在撞擊的隕石坑一半大小的巖石形成。
But the Moon is rarely in the right place at the right time.
但是月球很少在正確的時間出現在正確的地點。
Nothing can stop the asteroid now.
現在沒有什么能阻止這顆小行星了。
This cosmic missile isn't as alien as it seems.
這顆宇宙飛彈看起來并不陌生。
Like the earth itself. It's made up largely of rock and water.
就像地球本身這個小行星絕大部分由巖石和水組成。
In the cold vacuum of space, the water freezes into a hard permafrost.
在寒真空的太空里水凝固成堅硬的永凍層。
But on the inside, there's a chemical cocktail composed of carbon, hydrogen and oxygen.
不過在里面有一種化學混合物，當中包括碳氫和氧
Key ingredients for lifes.
都是構成生命基本要素。
Asteroid fragments like this one may have provide the building blocks for life on Earth.
像這樣的小行星碎塊，可能為地球上的生命提供了基本元素
Life, it evolved into dinosaurs.
最后演化成恐龍。
But what gives life, can also take it away.
不過孕育生命的東西也可能奪命
Most dinosaurs in the valley hunt and forage during the day and sleep at night.
山谷里多數恐龍白天獵捕和覓食晚上睡覺
This giant herbivore,an Ankylosaurus keeps one eye open for predators.
這種巨型的草食動物背甲龍對掠食者保持警覺。
Under the cover of darkness, very different creatures emerge from their hiding places.
在黑幕籠罩下截然不同的生物從藏匿處現身
Like Mesodma, a primitive mammal about the size of a possums.
像擬間異獸一種和負鼠差不多大的原始哺乳類。
like most other mammals, Mesodma's life is all about being with the dinosaurs earth.
跟其它大多數哺乳類一樣,擬間異獸的首要大事就是避開恐龍
It only comes out at night,to forage for tasty roots and insects.
它只在晚上出來覓食找好吃的根和蟲子
While the giants sleep, It's the meek that witness a cosmic event.
巨龍沉睡時溫馴的小動物見證了宇宙異象。
A meteor shower.
一場流星雨。
