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。
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。
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。
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。
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。
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。
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。
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。
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。
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。
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。
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。
PASADENA, Calif. - Send a robot into space. Grab an asteroid. Bring it back to Earth orbit.
加州帕萨迪纳市——将机器人发射入太空，抓取一个小行星，然后把它拖回地球轨道。
It might help us understand how to destroy an asteroid and even prevent one from hitting us.
它也许能帮助我们了解如何摧毁小行星，甚至防止小行星撞击我们。
NASA will not return humans to the moon but might visit an asteroid-and much later Mars.
美国航空航天局放弃其人类重返月球的计划，取而代之的是探访一颗小行星和经过较长的一段时间后再探访火星的计划。
In the alternative, say theorists, we could also capture an asteroid and simply haul it into place.
一些理论家给出了一种替代方案——捕捉小行星来将其轻松地拖到指定位置。
If that turns out to be from an asteroid impact, it would be the largest crater found on Earth. Ever.
如果这是由行星撞击所形成，毫无疑问，它将是地球上最大的陨石坑。
In the alternative, say theorists, we could also capture an asteroid and simply haul it into place. Um, o.
一些理论家给出了一种替代方案——捕捉小行星来将其轻松地拖到指定位置。
Another thing worrying Mr Schweickart is that NASA has no plans to test an asteroid-deflection scheme.
另一件让施威卡特感到头疼的事则是美国宇航局还未计划对偏转小行星方案进行检验。
Earth got a close shave Monday morning from an asteroid so small it was originally mistaken for space junk.
周一早晨一颗小行星和地球擦肩而过，曾因为其太小而误认为是太空垃圾。
Favorite hypotheses include an asteroid impact, massive volcanic eruptions in Siberia, and toxic oceans.
人们所热衷的假设包括小行星碰撞，西伯利亚大规模的火山爆发以及海洋毒化等现象。
The find provides support for the theory that Earth's water could have been delivered as ice by an asteroid.
有理论认为地球上的水可能是由其它小行星以冰的形态运送而来，如今的这一发现为该理论提供了有力佐证。
An asteroid impact is another possible cause of the extinction, though a telltale crater has yet to be found.
来之于小行星的撞击是物种灭绝的另一种可能的原因，尽管一个有报警作用的弹坑已经被找到了。
For the next 135 million years, the great lizards ruled Earth. Then an asteroid struck the Yucatan Peninsula.
在接下来的1.35亿年里，这些大蜥蜴开始统治地球，直到一个小行星撞击在尤卡坦半岛。
For the next 135 million years, the great lizards ruled Earth. Then an asteroid struck the Yucatan Peninsula.
在接下来的1.35亿年里，这些大蜥蜴开始统治地球，直到一个小行星撞击在尤卡坦半岛。
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