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Such wild climatic swings would have made the planet uninhabitable.
这样疯狂的气候变化 会使得地球无法居住
Vet there's something rather strange happening to the Moon
但是月球的行为很奇怪
that means we shouldn't take it for granted.MeetJerry Wiant.
这意味着我们不能不懂得珍惜 认识一下杰瑞·维恩特
Every morning, he rides up to the McDonald Observatory in West Texas,
每天早上，他都开摩托去得克萨斯西部的麦克唐纳天文馆
and it's thanks to his work that we know something extraordinary about the Moon.
多亏了他的努力 我们了解到了月球独一无二的特点
So, how many times do you make this journey?
你走这条路多少次了？
Every day for 37 years.37 years! -Yeah, on this bike.
连续37年，没有任何间断 37年-是的，就骑这个摩托
You're joking? -No, this one bike.That's it up there, is it? -Yeah.
你开玩笑吧-没有，就它 就在上面，是吗？-是的
Jerry's job is deceptively simple.
杰瑞的工作看起来很简单
Once a day, he fires a laser at the Moon in order to measure its distance from Earth.
他每天都要向月球发射一束激光 为了测量它与地球的距离
Measuring the distance to the Moon is quite simple.
测量月球距离很简单
We start with a bundle of light,we send it through a telescope,
我们用望远镜发射一道光朝向月球 它到达月球后照射到反射镜
when it reaches the Moon it hits a reflector,and it comes back toward Earth.
它到达月球后照射到反射镜 激光反射回地球
We intercept that with our telescope and what we do is we time when the light left
我们纪录光发射和回来的时间 我们纪录光发射和回来的时间
and we time when the light comes back, and that's our data.
这就是来回的距离这就是我们的数据
