It's from meteoroids that we get meteors and meteorites.
我们从流星体中得到流星和陨石。
The idea isn't that these building blocks are just passengers aboard meteorites.
这个想法并不是说这些构件只是陨石上的乘客。
Even today, microscopic meteorites continually bombard Earth, falling on both land and sea.
即使是现在，微小的陨石仍在不断地撞击地球，然后落到陆地上和大海中。
But we can use metal detectors to help us find other meteorites, and they're easier to spot by eye.
但是我们能用探测器帮助我们找到其他陨石，而这些陨石也更容易通过肉眼发现。
Even diluted by the terrestrial material excavated from the crater, this component of meteorites is easily identified.
即使被从陨石坑中挖掘出的陆地物质稀释，这种陨石成分也很容易识别。
The group conducting the study concluded from a detailed analysis that impacts from meteorites can indeed be hazardous.
进行这项研究的小组通过详细分析得出结论：陨石的撞击确实是危险的。
Ir is found in high concentrations in some meteorites, in which the solar system's original chemical composition is preserved.
人们发现，在一些保存着太阳系原始化学成分的陨石中，铱元素的含量很高。
Iridium occurs in meteorites and volcanic material, but in the latter case it is accompanied by elevated levels of nickel and chromium.
铱存在于陨石和火山物质中，但在火山物质中同时包含高浓度的镍和铬。
I wanna go over the different types of meteorites, and what we've learned from them about the formation of Earth, and the solar system.
我将介绍陨石的不同类型，以及我们能够从中了解到的有关地球和太阳系的形成的知识。
There is increasing evidence that the impacts of meteorites have had important effects on Earth, particularly in the field of biological evolution.
越来越多的证据表明，陨石的撞击对地球产生了重要的影响，特别是在生物进化领域。
Impacts by meteorites represent one mechanism that could cause global catastrophes and seriously influence the evolution of life all over the planet.
陨石的撞击代表了一种可能导致全球性灾难并严重影响地球上所有生命进化的机制。
All these diverse constituents are aggregated together to form chondritic meteorites, like Allende, that have chemical compositions much like that of the Sun.
所有这些不同的成分聚集形成像阿连德一样的球粒陨石，具有很类似于太阳的化学成分。
Its radio begins to transmit an astonishing amount of information about the satellite's orbital path, the amount of radiation it detects, and the presence of meteorites.
无线电开始传输大量信息，都是关于卫星的轨道路径、探测到的辐射量以及陨石的存在的。
So to talk about where meteorites come from, we need to talk about comets and asteroids.
那么讲到流星体从何而来，我们就需要讨论下彗星和小行星。
什么是陨石？
Some meteorites are rich in organic compounds.
一些陨石中有机物很丰富。
And do meteorites pose a greater danger to Earth than once thought?
亦或者陨石对地球的威胁究竟有没有我们原先想的那样大？
On the other hand, he refused to believe meteorites fell from the sky.
在另一方面，他却拒不相信陨石是从天上掉下来的。
They were blasted off that planet's surface when it was hit by huge meteorites.
当行星被巨大的陨石撞击时，它们离开了行星的表面。
They also saw meteorites known to have come from the red, or reddish, planet.
他们还看了来自火星这红色或带红色的行星的陨石。
So like all natural phenomena, meteorites deserve our respect, but not our fear.
如同所有的自然现象，流星值得我们关注，却不必恐惧。
They are, in other words, meteorites. And they are on sale at Bonham's New York gallery.
换句话说，它们就是陨石，且在邦汉姆的纽约展览馆待售。
Previous studies found meteorites harbour the other two of the three basic ingredients of life.
早先的研究也发现陨石内蕴含构成生命的三种基础成分中的两样。
About one in every 20 meteorites that falls on the surface of the Earth is probably a bit of Vesta.
落在地球的陨石中，每二十块中就约有一块可能来自灶神星。
The idea of looking for transplanted life stemmed from studies of meteorites from Mars that landed on Earth.
寻找被移植的生命体的想法源于对落在地球上的火星陨石的研究。
Basic organic (life) chemicals such as amino acids have been detected in nebulae and meteorites (see meteors).
构成生命组织的基本化学物如氨基酸，在星云和陨石中也被发现。
Because a few dozen of the meteorites that have fallen to Earth come not from the asteroid belt but from Mars.
因为有几十块落入地球的陨石不是来自于小行星带，而是直接来自火星。
One theory about the existence of extraterrestrial life rests on the presence of carbon compounds in meteorites.
地球外存在生命的理论是基于陨星上存在碳化合物质这一事实的。
Samples of meteorites that originated from planetesimals indicate that the rocky bodies contained tiny amounts of water.
源于石质天体星子(planetesimals)的陨石样品表明这些石质物体包含微量的水。
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