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Each streak of light is a tiny fragment of the asteroid collision.
每一道光都是小行星碰撞產生的小碎塊
Burning up as it entered the atmosphere.
它們在進入大氣層時燃燒起來
But these are mainly outrider of the much larger missile hurdling through space.
不過這些只是打頭陣的，后頭還有一顆飛越太空更大的飛彈
An asteroid locked into a head-on collision.
這顆小行星鎖定了正面撞擊的航道
The Day of Reckoning is here.
最后的審判近在眼前了
After a journey last in a hundred million years, an enormous chunk of cosmic rock
經過了歷時一億年的太空之旅后，這塊巨大的宇宙巖石逐漸接近終點線
And the end of the line is Earth.
而這條終點線就是地球。
In what is today central Mexico, a herd of Alamosaurus is wandering the plains in search of food.
在今天的墨西哥中部，一群阿拉摩龍正在平原上游蕩尋找食物。
They're recent species to evolve.
它們是最近演化出的物種
Ever by dinosaur standards, they're huge.
以恐龍的標準來看，它們也算很龐大。
They're the last of the Sauropods, the biggest animals ever to walk the Earth.
它們是最后一批蜥腳類是地球上有史以來最大的動物
70 feet long and a staggering 40 feet tall, Alamosaurus weigh up to 30 tons.
這種龍有70英尺長，驚人的40英尺高，重達30噸。
To maintain that bulk, they need to eat up to a ton of leaves every day.
為了維持這樣的龐大身軀，它們每天需要吃掉一噸的樹葉。
A vast herd like this one strips a landscape of vegetation in just a few hours.
像這樣一群龐然大物，短短幾小時就能吃光一個地方所有的植物
Because she's nomad constant search for food, when it's time for this female to lay her eggs,she doesn't nest.
因為它們為了覓食要不斷遷居，母龍到了下蛋的時候不會蓋巢穴
She simply lays eggs in groups of five or six to improve the chances that some will survive.
它只是以五、六個蛋為一組產卵，以提高其中一些的存活幾率。
Under normal conditions, only one in 3,000 will produce a mature Alamosaurus.
在正常情況下，每3000頭中只有一頭能孵出成年的阿拉莫龍。
But the odds stacked against these eggs are about to get astronomical,
但對這些蛋要對抗的卻是大規模的天文想象，
Because now, just 20 minutes away, 2 trillion tons of rock is racing right at them.
因為再過20分鐘，就有2兆噸巖石正撞擊著它們。
The asteroid fragment's enormous mass is only part of the threat. The other part is velocity.
小行星碎塊的巨大質量,只是威脅的一部分。另一部分是速度
But, as it gets closer to the planet, the earth's gravitational pull gets stronger, and the asteroid accelerates,
但是，隨著它越靠近地球，地球的引力就越強，這顆小行星就會加速，
past 40,000 to 45,000 miles per hour.
時速超過4萬至4萬5千英里。
And mass times acceleration equals force.
質量乘以加速度就等于能量
