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恐龙是因为小行星撞击灭绝的吗? – 译学馆
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恐龙是因为小行星撞击灭绝的吗?

Did an asteroid kill the dinosaurs?

是小行星撞击让恐龙灭绝了吗
>>AKI WATANABE (paleontologist, NYIT & AMNH):Did an asteroid kill the dinosaurs?
[音乐][砰]
[MUSIC] [BOOM] >>WATANABE:
古生物学家认为
Paleontologists agree that an
约在六千六百万年前的白垩纪末期
asteroid did strike Earth at the end of the Cretaceous period,
有一颗小行星撞击了地球
at around 66 million years ago.
我们对此都深信不疑
And we know this
因为在墨西哥的尤卡坦半岛
because there is an impact crater in the Yucatan Peninsula of
有个陨石坑
what’s now Mexico.
当时的石头图层
And the rock layers
显示里面有一种地球上很稀少
from that age include an element called iridium which is rare on
而在行星上相对丰富的铱元素
Earth but relatively abundant on asteroids.
点击这里的链接了解更多小行星的知识
And you can learn more about the asteroid itself by clicking the link here.
很明显这对地球上的生物
It obviously had a drastic impact
包括霸王龙 三角龙这样的恐龙
on life forms on Earth, including dinosaurs like
带来了巨大的影响
T-rex and Triceratops.
因为行星实在是太大了
So because the asteroid was really big,
所以这撞击带来的一定是全球性的影响
the impact would have had global consequences,
不仅来的快 持续时间也很长
both immediate and then also long-term.
开始的效果就像是森林火灾 大海啸
There would have been initial effects like forest fires and giant tsunamis,
但是撞击带来的落弹数
but the projectiles
将会导致冬季的冲击
that came off of the impact would have led to impact winters
会使地球冷却
which would have cooled
致使地面吸收不到阳光
down the Earth and also blocked sunlight fromhitting the ground.
植被大量枯死
And the vegetation would have suffered,
导致许多生态系统崩溃
which would have led to the collapse of a lot of ecosystems.
所以很明显
So its very clear
地球生物受到的主要影响是小行星撞击
that the asteroid impact had a major effect on life on Earth.
但是我们想要得出的是
But what we’re trying to figure out is
小行星撞击是导致恐龙灭绝的
whether the asteroid was the only factor, or the major
唯一因素还是首要因素
factor that led to the extinction of dinosaurs.
一些古生物学家提出
Some palentologists have proposed
恐龙早在小行星撞击之前
that the dinosaurs were already on a decline before
就已经在减少了
the impact of the asteroid.
不过这个假设很难证明
But this hypothesis is difficult to prove just
因为我们没有清楚完整的
because we don’t have a clean complete
恐龙灭绝之前之中之后的记录
record of dinosaurs right before, during,and after the extinction event.
所以很难说
So it’s hard to tell
是不是恐龙在经历小行星撞击前
whether all the dinosaurs were already on a path to extinction, even
就已经在慢慢灭绝了
without help from the asteroid impact.
还有证据显示那时候火山活动频繁
There’s also evidence of an increase in volcanic activity at that time.
有许多的火山岩浆和颗粒从地底下喷涌而出
There was a lot of lava and volcanic particles spewing out from under ground.
这和冬天的冲击有类似的影响
This would have led to similar effects asthe impact winters.
所以火山活动的增加
So the increase
可能是促使恐龙灭绝的
in volcanism might have contributed additional forces that led to
另外诱因
the extinction of dinosaurs.
尽管地球并不全是昏天黑地
It’s not all doom and gloom though.
像鸟类的那种恐龙可以在灭绝事件中存活
One dinosaur group we know as birds did survive through the extinction event.
我们远古的哺乳动物同样也可以
And also us mammals did as well.
化石记录告诉我们
What the fossil record tells us is that certain animals,
身体体积小的和生活在海洋的
usually smaller-bodied and also those
在灭绝时期存活得更好
that lived in the oceans tended to fare better at this extinction event.
所以现在活着的生物
So all the animals that are alive today represent descendants
代表的是在这次小行星撞击中
from a group that actually did
幸存的那些生物的后代
survive this asteroid impact.
回答最开始的问题
So to answer the original question,
小行星撞击的确给恐龙
the asteroid impact did have a devastating
造成了毁灭性的打击
effect on the dinosaurs.
但古生物学家还发现更精确的细节
But paleontologists are still working outthe finer details.
并且对这个灭绝事件了解得更加清楚
And learning more about this extinction event,
可以帮我们了解其他的灭绝事件
could help us to learn about other extinction events,
包括我们现在面临的这个
including the one we’refacing right now.
谢谢收看本期视频
Thanks for watching the video.
想要了解更多有关小行星
To learn more about the asteroid,
确认点击以上链接
make sure to click the link above for
观看这周的空间视频
this weeks’ space video.
如果你有任何关于恐龙的问题
And if you have any questions about dinosaurs,
请在下面评论区留言
leave them in the comments section below.
记得订阅AMNH
Don’t forget to subscribe to the AMNH channel
获取更多相关的视频
for more videos like this!

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视频概述

恐龙灭绝的原因

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视频来源

https://www.youtube.com/watch?v=2B9XmiOIA4E

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