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。
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。
The largest asteroid is Ceres, which is about a quarter the size of the moon.
最大的小行星是谷神星，其体积大约是月球的四分之一。
Astronomers have detected an asteroid not far from Earth, moving in the same orbit around the Sun.
天文学家在距离地球不远处发现一颗小行星，它与地球在同一轨道上围绕太阳运行。
This iridium anomaly offers strong support for the Alvarez hypothesis even though no asteroid itself has ever been discovered.
这一铱异常为阿尔瓦雷斯假说提供了强有力的支持，尽管小行星本身从未被发现。
Some scientists hypothesize that the extinction of the dinosaurs resulted from the effects of an asteroid collision with Earth.
一些科学家假定，小行星撞击地球导致了恐龙的灭绝。
An asteroid of this size would be expected to leave an immense crater, even if the asteroid itself was disintegrated by the impact.
这样大小的小行星即使受到冲击碎裂之后也会留下一个巨大的陨石坑。
Moving on through the asteroid belt we enter the realms of the gas giant planets: Jupiter, Saturn, Uranus, and Neptune, all of which dwarf the Earth.
穿过小行星带继续前进，我们进入了气体巨行星区域：木星、土星、天王星、海王星，所有这些都使地球看起来像个侏儒。
Debris thrown into the atmosphere by an asteroid collision would presumably contain large amounts of iridium, and atmospheric currents would carry this material all over the globe.
小行星碰撞后的碎片可能会含有大量的铱，而大气洋流会把这些物质带到全球各地。
Paradoxically, while the temperatures required for liquid water exist only in the inner solar system, the key building blocks of life, including water itself, occur primarily beyond the asteroid belt.
矛盾的是，虽然液态水所需的温度只存在于太阳系内部，但生命的关键组成部分，包括水本身，却主要存在于小行星带之外。
Now utopia has grown unfashionable, as we have gained a deeper appreciation of the range of threats facing us, from asteroid strike to epidemic flu and to climate change.
现如今，这种乌托邦空想已经过时了，我们对所面临的威胁有了更深刻的认识，从彗星撞击到流行感冒，再到气候变化。
She is orbiting the sun as the asteroid 216 Kleopatra.
编号为216Kleopatra的小行星正绕着太阳运行。
Will an asteroid hit the Earth?
会不会发生小行星撞击地球的事件呢？
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。
If the world wants to know about an asteroid, we have the catalog.
如果世界上有人要了解某颗小行星，我们这里就有它的目录。
And this time the cause isn't an errant asteroid or megavolcanoes. It's us.
这次大灭绝的罪魁祸首并不是四处游荡的小行星或威力巨大的火山爆发，而是人类自己。
The bad news is that forecasting asteroid impacts remains a tricky business.
坏消息是预测小行星撞击不是件容易事。
The agency's plans to send humans to Mars or an asteroid are in deep freeze.
该机构将人类送上火星或小行星的计划也同样束之高阁。
The goal of the program is to send astronauts to explore an asteroid by 2025.
该项目的目标是在2025年把宇航员送入太空去探索小行星。
In the case of a planet, the hole is carved out by an asteroid or comet impact.
对于行星，这个洞就是由小行星或彗星碰撞打开的。
They flew to the nearest refuge, the asteroid mining colony of Polis Massa.
他们飞到最近的避难所——波利斯·马萨小行星采矿殖民地。
The asteroid was first spotted during a routine survey performed by a satellite.
这颗小行星是在一次例行检查中被一颗卫星发现的。
Perhaps we'll fail to mitigate the threat posed by asteroid and comet collisions.
我们也许会没能成功地减轻小行星和彗星碰撞所带来的威胁。
The dinosaurs were done for, as everybody knows, by a collision with an asteroid.
正如大家所知，恐龙的终结是由于地球与一个小行星发生碰撞。
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。
But until now, no such asteroid-asteroid collision has been caught "in the act".
但是，直到今天，我们都没有“当场”捕捉到这种小行星对小行星的碰撞。
An asteroid 500 feet across could destroy a metropolitan area or spawn massive tsunamis.
500英尺直径的小行星可能毁灭整个大都市，或引发大规模海啸。
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