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To our surprise, something as complex as a planet is made from nothing more than dustand rocks.
像行星這么復(fù)雜的物體，似乎不可能只由塵埃與巖石組成。
Over millions of years, gravity pulls these rocks together to form the Earth,
數(shù)百萬年來，重力把這些巖石聚集成地球，
one of at least a hundred planets circling the sun.
至少有99個(gè)行星跟它一起繞太陽運(yùn)轉(zhuǎn)。
But four and a half billion years ago,
但在45億年前，
Earth looks more like hell than home.
我們的行星比較像地獄而不像家。
Up close the temperature is over 2,000 degrees Fahrenheit.
近處溫度超過攝氏1200度。
There's no air, just carbon dioxide, nitrogen and water vapor.
沒有空氣。只有二氧化碳、氮跟水蒸氣。
It's so hot and toxic that if we got any closer we'd be incinerated and suffocated in seconds.
它既熱且毒，若再靠近，我們會(huì)在數(shù)秒內(nèi)燒成灰、窒息而死。
This newborn planet is a boiling ball of liquid rock; an endless ocean of lava.
新生的地球是一團(tuán)沸騰的液態(tài)巖石、無邊無際的熔巖海。
A young planet called Theia is heading straight for Earth.
名為忒伊亞的年輕行星直撲我們而來。
The size of Mars, it travels nearly 10 miles per second,
它與火星同大，并以近15公里的秒速移動(dòng)，
twenty times faster than a bullet.
比子彈快20倍。
