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。
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。
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。
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。
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。
To future geologists, Zalasiewicz says, our impact may look as sudden and profound as that of an asteroid.
Zalasiewicz说，根据多角度预测，对于将来的地层学家来说，是无法比拟的，我们的影响就像那颗突然出现的奥秘无穷的那颗小行星一样。
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。
NASA has largely dismissed a Russian report that an asteroid larger than two football fields could hit Earth by 2036.
美国国家航空和宇宙航行局在很大程度否定了一份俄国的报告，该报告称一个比两个足球场还大的行星可能于2036年撞击地球。
Leigh Fletcher, researcher at Oxford University, summarized why all the evidence is pointing at an asteroid impactor.
利弗莱彻(Leigh Fletcher)，牛津大学的研究员，总结了为什么所有的证据都指向小行星？
Helfand added that tracking an asteroid is just the first step. The next step is prevention of a collision with Earth.
希尔·芬迪补充道，追踪小行星仅仅是第一步工作，下一步工作是防止其与地球发生碰撞。
Duxbury thinks these grooves were created when an asteroid impact threw up large boulders that rolled from the crater.
克斯·伯里认为，小行星撞击福波斯地表后，产生的巨大岩石滚过陨石坑，就形成了这些凹痕。
Many scientists believe the Earth suffered a direct hit from an asteroid or that a comet could be to blame for the extinction.
许多科学家认为，地球遭受小行星或彗星的直接撞击可能是恐龙灭绝的原因。
The debris, which came from an asteroid that was once 125 miles long, showed little carbon and high levels of calcium and iron.
碎片来自125英里长的小游星，由微弱的碳和大量钙、铁组成。
The debris, which came from an asteroid that was once 125 miles long, showed little carbon and high levels of calcium and iron.
碎片来自125英里长的小游星，由微弱的碳和大量钙、铁组成。
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