它们实际上在落在地球上的陨石物质中占了接近总数。
They actually account for almost all of the meteorite material that falls to earth.
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。
Iridium occurs in meteorites and volcanic material, but in the latter case it is accompanied by elevated levels of nickel and chromium.
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。
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.
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。
Even diluted by the terrestrial material excavated from the crater, this component of meteorites is easily identified.
曾经有人认为，这些基质颗粒可能是原始的星云尘埃，即形成陨石球粒及其内含物的物质。
At one time it was thought that these matrix grains might be pristine nebular dust, the sort of stuff from which chondrules and inclusions were made.
围绕在月球陨石坑周围的喷出物，正是人们所能预料到的在一次爆炸中能得到的物质，爆炸喷发出大量灰尘、土壤和岩石。
The ejecta surrounding the lunar crater is just what one would expect from an explosion ejecting a large volume of dust, soil, and boulders.
阿连德陨石中同样令人困惑的成分是那些耐高温的内部物质：往往比陨石球粒要大的不规则白色块状物。
Equally perplexing constituents of Allende are the refractory inclusions: irregular white masses that tend to be larger than chondrules.
我们知道，行星研究人员喜欢研究深深的陨石坑，以了解造成这些陨石坑的撞击，以及它们是如何重新分配行星的地壳物质的。
You know planetary researchers love studying deep craters to learn about the impacts that created them, and how they redistributed pieces of the planet's crust.
如果要检测硬度，陨石的标本就太小，它只能显示出这种物质无疑比一般钻石硬。
The sample from the meteorite was far too small to test for hardness, except to show that it is certainly harder than regular diamonds.
陨石上发现的遗传物质。
另外一个有冰存在的迹象就是陨石坑底部的并行线和无核物质。
Another sign of ice is the presence of parallel lines and pitted material on the crater floor.
这块陨石从外太空而来。它包含着氨基酸、糖类和其他有机物等构成生命的物质。
It came from outer space. It being the stuff of life-amino acids, sugars and other organic molecules.
这些希腊平原上的陨石坑内填充着一些物质，而这些物质与盆地西部边远的火山活动有关。
The crater inside Hellas has been filled with material, which may be related to volcanic activity on the basin's northwestern rim.
在陨石坑口壁上也发现了并行线一样的裂缝，这可能是由于含冰物质热收缩现象造成的。
Parallel linear cracks are also observed along the crater wall over the gullies, which could be due to thermal contraction of ice-rich material.
尽管月球上水和其他物质的浓度和分布还需进一步分析，但可以放心地说，凯布斯陨石坑中存在水。
The concentration and distribution of water and other substances requires further analysis, but it is safe to say Cabeus holds water.
据研究看来，默奇森陨石的年纪可能比太阳都大，还在太阳系的婴儿时期它路过原始星云，让这些化学物质搭了便车。
According to the study, the Murchison meteorite is possibly older than our sun and picked up its chemical hitchhikers in the solar system's infancy as it passed through primordial clouds.
用于探测金星的麦哲伦号绘制完成了金星表面98%的地形图，它传回的数据表明金星的大部分地区都被火山物质所覆盖，其间点缀着一些陨石坑。
Magellan mapped more than 98 percent of the surface of Venus, and revealed the planet to be mostly covered by volcanic materials, dotted with a few impact craters.
但是，对陨石进行2000华氏度(1100摄氏度)自然增温之后，却第一次在陨石上发现了这种物质。
But this is the first time the substances have been found in meteorites that had been naturally heated to 2,000 degrees Fahrenheit (1,100 degrees Celsius).
令人惊讶的是，Lcross在位于月球南极附近的Cabeus陨石坑中发现大量的其他物质和其他分子。
Also surprising was the cornucopia of other elements and molecules that Lcross scooped out of the Cabeus crater, near the Moon's South Pole.
碳有两个非放射性的同位素，在太阳系的物质中，包括在大多数的陨石矿石中，它们的混合比例是众所周知的。
Carbon has two non-radioactive isotopes, and in material from the solar system, including most meteoritic minerals, these are mixed in a well-known ratio.
但是在某些情况他们也被认为是由于到来自陨石冲击的物质巨涌产生的。
But in some cases they are attributed to surges of material from meteorite impacts.
最近在对该陨石进行检测时，科学家观测到了一种奇怪的物质，它看起来像是一枚有裂纹的鸡蛋，大小跟一颗大米粒差不多。
While recently examining the meteorite, scientists spotted an odd material that looked like a cracked egg and was about the size of a grain of rice.
陨石中基质橄榄石矿物是本陨石中原物质，而角砾状橄榄石是宇宙中物质。
It indicates that the matrix olivine was from the host meteorite and the brecciform olivine was from the other cosmic substance.
其次，陨石表面有金属镶嵌点，呈现金色或者银色，这表明内部可能有金属物质；
Second, the surface of a metal meteorite embedded points, showing a gold or silver, suggesting that there may be internal metals;
也可能被其他的矿物质储存在其表面，或者储存在外来的冰陨石中，甚至可能被某种东西疯狂地吞掉。
It could be stored on the surfaces of minerals, or locked into exotic ices, or even eaten by yet more bugs.
因为冲击波的能量在多孔隙物质中快速减弱，撞击能使上述深陨石坑附近的岩石有效加热。
Because shock energy attenuates rapidly in porous materials, an impact can heat the rocks bordering the deep crater very efficiently.
从而认为，这些玻璃微粒并非为海底火山物质，而是典型的微玻璃陨石，并指出它们有可能起源于月球火山作用。
It is bilived that these glassy particles are not volcanic materials in ocean floor but are typical microtektites. It is suggested that they may be of lunar volcanic origin.
在图像的中心，一个陨石坑地面将近50公里宽覆盖着黑色的物质。
In the centre of the image, the floor of an impact crater almost 50 km wide is covered in dark material.
比如，影像右上角可以看到一些陨石坑在巨大卡罗·维斯低地的碰撞特征，看上去有黑色物质环绕，形成的原因正在研究中。
A few craters, such as some in the huge Caloris Basin impact feature visible on the upper right, appear unexpectedly to be ringed with a dark material, the nature of which is being researched.
比如，影像右上角可以看到一些陨石坑在巨大卡罗·维斯低地的碰撞特征，看上去有黑色物质环绕，形成的原因正在研究中。
A few craters, such as some in the huge Caloris Basin impact feature visible on the upper right, appear unexpectedly to be ringed with a dark material, the nature of which is being researched.
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