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When an asteroid or comet that large hits the earth,
小行星或彗星猛烈撞擊地球的威力，
it's the equivalent of a billion atomic bombs going off at the same time in the same place.
相當于10億枚原子彈在同一時間同一地點爆炸。
Almost immediately afterwards millions of tons of dust would have shut out of the sun.
幾乎就在同時，數百萬噸煙塵遮蔽了陽光。
It would all have happened very rapidly,
這一切發生得都很突然，
much faster than the climate changes caused by a flood basalt eruption.
比泛布玄武巖噴發造成的氣候劇變快得多。
Temperatures would have plummeted almost overnight.
氣溫在一夜之間驟降。
Makes a huge crater and throws a tremendous amount of dust and debris up into the earth's atmosphere,
形成一個巨大的隕石坑和大量塵埃以及碎片被拋進地球大氣層，
and you end up with a catastrophic situation for life on the planet.
地球上的生物只得面臨悲慘的結局。
Rampino's calculation suggested this would've been a far bigger, harsher, more rapid nuclear winter than anything the Siberian Traps could have caused.
Rampino的計算顯示，這個核冬天比先前推測的西伯利亞地盾引起的核冬天更龐大、更嚴酷，也更短暫。
Life would have rapidly become almost impossible.
生命幾乎在霎那間消亡殆盡。
A meteor from outer space sounds like science fiction, but there has been a similar case.
天體碰撞聽起來像是科幻小說，不過確實發生過類似的事件。
Most scientists now accept that 65 million years ago, the dinosaurs were wiped out by just such an event,
大部分科學家都認為恐龍的滅絕就是因為發生在6500萬年前的這類災難，
but the Permian meteor would have been even bigger.
而二疊紀的這顆隕星必定更加巨大。
