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。
I mean, it's easier to find an iron meteorite or a stony iron.
我的意思是，找到铁陨石或石质铁会更容易。
They actually account for almost all of the meteorite material that falls to earth.
它们实际上在落在地球上的陨石物质中占了接近总数。
The first meteorite from this fall was found in the village of Pueblito de Allende.
在阿连德布比滔村，人们发现了第一块坠落的陨石。
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。
Genetic Material Found on meteorite.
陨石上发现的遗传物质。
What if a meteorite falls on the plant?
如果一颗流星砸中核电站又怎么办？
A big meteorite strike today would certainly kill billions.
如果今天有一场宇宙冲击，毫无疑问能摧毁数十亿生命。
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。”
During desert treks, scientists later recovered nearly 600 meteorite fragments from the meteor shower.
在小行星的沙漠之旅中，科学家们随后在流星雨中发现了将近600种宇宙物质。
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。
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