了解宇宙是如何运行的（2010）

How the Universe Works S08E01

Part 17 Jan. 30, 2022, 2:58 p.m.

a big impact doesn't have to be
它正在摧毁我们的星球
as it's bearing down
destroying our planet.
我们可以在它到来之前
We can actually see it
before it gets to us
看到它并决定我们要做什么
and decide
what we want to do about it.
地球的历史充满了小行星撞击
Narrator: Earth's history is
littered with asteroid strikes.
曾经灭绝了数百万种物种
Some wiped out
millions of species.
有些可能一开始就播下了生命的种子
Some may have seeded life
in the first place.
没有人知道未来会怎样，也没有人知道
What the future holds
and our relationship
我们与这些太空岩石的关系
with these space rocks,
no one knows.
尽管大型天体撞击地球的几率
Even though the chances of
something really large hitting
很小，但后果是可怕的
the earth are pretty small,
the consequences are dire.
它真的会毁灭我们的星球或者至少是
It would really destroy
our planet or at least life
我们所理解的生命
as we understand it.
所以在很多方面，小行星是我们
And so in many ways,
asteroids are the greatest
面临的最大威胁
threat that we face.
生命是脆弱的，所以我们当然生活在一个
Life is fragile, so of course
we live in a larger environment
更大的环境中，任何时候都可能
where something could come
and hit us at any time.
有东西随时来攻击我们
That's part of being alive.
不能保证明天会发生
There's no guarantee tomorrow
will happen.
但很有可能明天
But what there is
is a high likelihood
你仍然是安全的
that you'll still be
safe tomorrow.
布洛克:来自太空的影响很少
Bullock: Impacts from
space are rare,
但如果真的发生了，那可是件大事
but if they do happen,
it's a huge deal.
所以你必须把这两件事放在一起
And so you've got to put those
two things together.
这意味着我们得注意了
That means we got to
pay attention.
杜尔达:这些影响在过去已经发生过很多次
Durda: Those impacts have
happened many times in the past,
未来还会继续发生很多次
and they're going to continue to
happen many times in the future.
幸运的是，这在我们不久的将来可能不会发生
Fortunately it's not probably
in our immediate future.
撞击很少见，但地球寿命很长
Impacts are rare, but the earth
lives a long time.
所以你不太可能出车祸
So you're unlikely to get
in a car accident,
但如果你开得够多，你就会出车祸
but if you drive enough, you're
going to get in a car accident.
超过一个世纪的时间尺度
Plait: Over a century
time scale,
是的，我们应该关注这些
yes, we should be concerned
about these.
但在每天、每周、每月甚至每年的时间尺度上
But over the daily, weekly,
monthly, even yearly time scale,
我不会太担心
I wouldn't sweat it too much.
我不会说我们应该因为小行星或彗星
I wouldn't say we should lose
sleep over an asteroid
撞击地球而失眠
or comet striking earth,
但事实是这种情况会再次发生
but the reality is
it will happen again.
塞勒:所以，当你想到小行星撞击地球的时候
Thaller: So when you think
about asteroid strikes,
请记住你所处的这个
remember this wonderful
dramatic universe
奇妙而充满戏剧性的宇宙
you find yourself in.
我们在这里是因为恒星的死亡和爆♥炸♥
We're here because
stars died and exploded.
如果我们没有在太空中
Life on earth wouldn't
be the same
发现自己处于这种戏剧性甚至是危险的环境中
if we didn't find ourselves
in this dramatic
地球上的生命将会不一样
and even dangerous environment
in space.
但这就是我们这不是什么新鲜事
But this is who we are.
This is nothing new.
这将持续到我们星球的未来
And this will continue
for the future of our planet.
♪