A meteorite streaked across the sky.
一颗流星划过天空。
The blast may have vaporized the meteorite.
爆炸可能使陨石汽化了。
The Allende meteorite is classified as a chondrite.
阿连德陨石被归类为球粒陨石。
Twice in the twentieth century, large meteorite objects are known to have collided with Earth.
"在二十世纪，已知有两次大型陨石与地球相撞的案例。
But that makes it easier to identify something as a meteorite, as opposed to just a terrestrial rock.
但是，这使得我们更容易将东西识别为陨石，而不仅是地面的岩石。
Scientists have linked the mass extinction at the end of the Cretaceous with a meteorite impact on Earth.
科学家将白垩纪末期的大灭绝与地球上的陨石撞击联系起来。
He collected pristine samples of the meteorite just days after they fell on the frozen lake, and stored them in his freezer.
几天后，他收集了落在冰冻湖面的陨石的原始样本，并把它们储存在他的冰箱里。
Meteorite impacts can be advantageous for some species, which thrive, and disastrous for other species, which become extinct.
陨石的撞击对某些物种是有利的，它们会茁壮成长；而对其他物种则是灾难性的，它们会灭绝。
It is theoretically possible that bacteria developed on Mars early in its history and that some were carried to Earth by a meteorite.
从理论上讲，细菌可能是在火星的早期发展起来的，其中一些是由陨石带到地球的。
Altogether, roughly two tons of meteorite fragments were recovered, all of which bear the name Allende for the location of the first discovery.
总共大约找到了两吨陨石碎片，所有的碎片都是以首次发现（陨石）的地点阿连德命名。
To compare the compositions of a meteorite and the Sun, it is necessary that we use ratios of elements rather than simply the abundances of atoms.
为了比较陨石和太阳的成分，我们需要利用元素的比率，而不单单是原子的丰度。
This sediment layer is enriched in the rare metal iridium and other elements that are relatively abundant in a meteorite but very rare in the crust of Earth.
这一沉积层富含稀有金属铱，以及其他在陨石中较丰富而在地壳中十分罕见的元素。
After all, the Sun has many more atoms of any element, say iron, than does a meteorite specimen, but the ratios of iron to silicon in the two kinds of matter might be comparable.
毕竟，太阳中任何元素的原子，比如说铁，都比陨石标本的原子要多得多，但这两种物质中铁和硅的比例可能是可以比较的。
They located a meteorite with a mass of over a trillion tons.
他们找到了一块重逾一万亿吨的陨石。
An iridium-enriched sediment layer and a large impact crater in the Yucatn provide evidence that a large meteorite struck Earth about 65 million years ago.
尤卡坦半岛上富含铱的沉积层和一个巨大的陨石坑提供了证据，证明了约6500万年前，一颗大型陨石撞击了地球。
It contained the largest amount of nanodiamonds of any meteorite studied so far.
它是目前所有被研究的陨石中，包含“纳米钻石”数量最多的陨石。
However, this doesn't mean a meteorite is going to fall from the sky on your car.
但是，这不是说会有陨石撞到你的车上。
Scientists unveiled a meteorite from Mars in which they said there were microscopic fossils.
科学家们揭开了火星上——火星上有很多微生物化石——的陨石之谜。
He chose a piece of the Canyon Diablo meteorite, which impacted about 50, 000 years ago in Arizona.
他选择了一块约50,000年前产生于亚利桑那州的峡谷暗黑陨石。
"It's a very rare type of meteorite, and it's a very oddball one even for that type," Sandford says.
桑福德说：“这是一种非常稀有的陨石，就算在其所在的陨石门类中也算是个异类。”
If they are different, a more plausible explanation is that the water came from comet and meteorite impacts.
如果它们不同，冰块源自彗星和撞击的陨石将是更有说服力的解释。
That raises the possibility that life on Earth arrived here on a meteorite - a concept called panspermia.
这也为一种叫做有生源说的概念提供了可能性，这一概念认为地球上的生命是由小行星带来的。
We can, in principle, now estimate how large a meteorite would have to have been to cause catastrophic events.
原则上，我们可以估算陨石撞击会引发多大程度的灾难性事件。
The researchers were polishing a slice of the carbon-rich Havero meteorite that fell to Earth in Finland in 1971.
研究人员当时打磨了一块碳元素丰富的海沃勒陨石。 这块陨石1971年坠落于芬兰。
They estimate that those compounds indicate that millions of different chemicals are present in the meteorite.
他们估计这些化合物表明这块石头里还有几百万种不同的化学物质。
Researchers analyzed four fragments of the Tagish Lake meteorite, which broke apart over northwest Canada in 2000.
科学家们研究了加拿大塔吉什胡陨石的四块碎片，这块陨石于2000年在加拿大北部上空爆炸形成大量陨石碎块。
Climate change, hunting by early humans, and even a meteorite are among theories for their abrupt disappearance.
有3种理论解释它们的突然灭绝：气候变化、原始人狩猎、陨星。
Patterson found a way around this. Instead of dating something in the ground, he dated something from the sky-a meteorite.
帕特森找到了解决这个问题的一种方式，他不去测定地上的事物，而从天上的事物——陨石着手。
In the new study, researchers located grains of the mineral apatite in thin sections from the moon rocks and meteorite.
在最新的一项研究中，研究人员在月岩和月陨薄碎片中找到了磷灰石的矿物颗粒。
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