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The Iridium must have come from an asteroid, but it must have been a second impact, three hundred thousand years later,
铱只能来自小行星，但那肯定已是30万年后的第二次碰撞，
for which we simply don't know where the crater is
我们并不知道这个陨石坑在哪，
and it is that impact that probably finished off the dinosaurs.
可能正是这次碰撞结束了恐龙时代。
If Keller was right, there hadn't been one impact but two.
如果Keller是对的，那么碰撞就不是一次，而是两次。
The first, Chicxulub, would have been devastating enough.
第一次是毁天灭地的希克苏鲁伯大碰撞。
It would have killed many dinosaurs...
它杀死了无数恐龙...
but it did not drive them to extinction, and it didn't create the Iridium layer.
但它并没有使它们灭绝，也没有形成铱元素层。
According to Keller and Stinnesbeck, even as earth absorbed the Chicxulub impact,
根据Keller和Stinnesbeck的理论，在希克苏鲁伯大碰撞阵痛未消之际，
deep in outer space a second asteroid was hurtling toward the planet
太空深处又有第二颗小行星正向地球飞来，
and this was the asteroid that left the telltale Iridium, and finished off the dinosaurs.
这颗小行星带来了铱元素，并且最终终结了恐龙。
