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Around 7 hundred million years, our planet started to cool.
大約7億年前 地球開始降溫。
It was the beginning of an Ice Age.
是一次冰河時代的發端
No one is quire sure why it happened,
沒人能確定發生原因，
but it seems that our entire word was plungedces into an interminable winter.
冰從地球兩極不斷蔓延 直至將整個世界拖入一個漫長的冰封冬季。
Some scientists have called it the time of snowball Earth.
某些科學家稱這段時期為“雪球地球”
because the whole planet would appear as an icy ball.
因為當時整個行星 看起來就是一個冰球。
Others believe that the Earth was cold but not completely frozen.
其他一些人認為地球是冷的 但是并沒有完全冰凍
Traveler to Jupiter and you can get some idea of what Earth might have looked like.
去木星看看 您對地球當時可能的模樣就有些概念
Europa is one of Jupiter's moons.A frozen landscape
歐羅巴是木星衛星之一
that might mirror parts of Earth millions of years ago.
冰凍現象可能是地球 數百萬年前的一面鏡子
but knowing what earth look like
僅僅知道地球的模樣
doesn't convey just how terrible the conditions would have been.
并不能準確體會到當時的情況
A blizzard, high in the Alps, in mid-winter, is as close as I can get.
冬季阿爾卑斯高處的暴風雪 是我能接觸到的與當時最接近的情況
