Scientists were debating whether an asteroid was about to hit the Earth.
科学家们在争论一颗小行星是否要撞上地球。
There is an asteroid on a collision course with the Earth.
有个小行星正处于可能与地球发生碰撞的航向上。
Will an asteroid hit the Earth?
会不会发生小行星撞击地球的事件呢？
我们能不能让小行星停止运行？
That means they most likely came from an asteroid.
这意味着它们最有可能来自一颗小行星。
But…it has entered an asteroid field and we cannot risk…
他们进到小行星群，但…我们不敢冒险前往…
Sometimes an asteroid will leave that path and hit Earth.
有时某个小行星会脱离这条轨道，并撞向地球。
Some of them could even become the first to visit an asteroid.
他们中的一些甚至可能第一个访问小行星。
It will probably be easier to do this on the moon than on an asteroid.
显然，在月球上完成这个任务比在小行星上完成要容易。
Astronomers have yet to witness an asteroid impact with another planet.
天文学家还没有目击过小行星撞击其它行星。
Potential destinations include an asteroid, the moon and eventually Mars.
现在以确定的潜在目的地有小行星，月球，当然最终自然是火星。
An asteroid, the size of nine ocean liners will pass close to earth today.
今天，一颗体积相当于9艘远洋邮轮的小行星将接近地球。
If an asteroid hit Earth, it's average speed would be 30kilometers per second.
假如小行星撞击地球，它们的平均撞击速度将达到30公里每秒。
An unmanned American spacecraft has made the first ever landing on an asteroid.
一艘美国无人驾驶探测器在一个小行星上首次着陆。
It's very unlikely that an asteroid will crash into Earth but the danger exists.
小行星撞地球的可能性很小，但这样的危险还是存在的。
About halfway through that period, known as the Triassic, an asteroid struck Earth.
在那段时期的中间，也就是三叠纪时期，一颗小行星撞击了地球。
About halfway through that period, known as the Triassic, an asteroid struck Earth.
在那段时期的中间，也就是三叠纪时期，一颗小行星撞击了地球。
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