Meteorites contain platinum and meteorites have been landing on earth for billions of years already. |
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Meteorites from one subcategory, the pallasites, contain large crystals of the mineral olivine imbedded in a matrix of metal. |
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In addition to such specimens as moon rocks and a meteorite studded with tiny diamonds, the Arthur Ross Hall of Meteorites contains the Cape York Meteorite. |
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Sources of other specific meteorites remain unproven, although another set of eight achondrites are suspected to have come from Mars. |
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More than ten minerals have been found in the Nantan meteorites with kamacite and taenite dominant. |
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The exception is a group of meteorites called howardites, eucrites, and diogenites. |
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The earth's crust is depleted in iridium and other platinum group elements, while meteorites are enriched in them. |
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Late-forming chondrules in meteorites are thus the last souvenirs of the process that formed our planetary system. |
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It is the famous Pallassovo Zhelezo meteorite, which gave its name to the entire class of iron-stone meteorites known as pallasites. |
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Most meteorites travelling towards earth burn up in the atmosphere, but it's estimated that on average, one does make it through each week. |
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Chondrites are made primarily of rock and so have a lower density than stony-iron meteorites, which contain some metal. |
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Chondrites are stony meteorites that contain small, melted beads known as chondrules and finer-grained material known as matrix. |
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This structure is very similar to kerogens found in carbonaceous meteorites. |
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On display are minerals, fossils, meteorites, and some rocks, most of which are of reference quality. |
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The age of the carbonates can be clearly determined, and some very old ones had been found on certain asteroids and meteorites. |
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Small impactors deliver meteorites, while large ones infrequently wreak global devastation. |
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When meteorites hit nearby worlds, they kick up bits of rock, some of which might have enough speed to escape from their planet entirely. |
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Even strong iron meteorites, not just weaker stony meteorites, are affected. |
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They are very similar in composition to the carbonaceous chondrite meteorites that sometimes fall on Earth. |
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Other Moon rocks brought back by the Apollo astronauts have helped in understanding the lunar meteorites found on Earth. |
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That is how fragments of the asteroid belt can end up crashing into Earth as meteorites. |
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Other sources of high iridium concentrations are extraterrestrial objects, such as meteorites or comets. |
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A record of the long term variations of the galactic cosmic ray flux can be extracted from Iron meteorites. |
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Its displays cover millions of specimens, including fossils, meteorites, mammals, plants, minerals, and insects. |
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Unique samples of moon rock and meteorites as old as the solar system landed on a Bickley girls' school. |
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Thus, meteorites represent a fossil record of the early conditions of the solar nebula. |
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It is brought to us by such solar system visitors as meteorites, which burn up or fragment and drift as fine particles through the atmosphere. |
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Grouped with iron meteorites, these are pieces from the cores of fledgling planets destroyed by collisions when the Solar System formed. |
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Silicon has also been detected in the Sun and stars and is found in certain types of meteorites known as aerolites. |
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This foil doesn't do very well in the air, but it protected it from meteorites and from the ultraviolet radiations from the sun. |
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The shop offers a wide range of Lunar and Martian meteorites along with many rare achondrites and chondrites. |
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We have a major research program to investigate the thermal histories of lunar rocks, achondritic meteorites, and Martian meteorites. |
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From the crusts of differentiated asteroids and planets come the meteorites we call achondrites. |
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Based on their texture, stone meteorites are divided into two types, the chondrites and the achondrites. |
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I expect she was trying to escape the Suffolk weather, which, when it's not bombarding us with thunderbolts and lightning, is chucking meteorites at us. |
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One possible source of such untainted data are Earth's lunar meteorites. |
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Museums of natural history display the biggest meteorites, tallest dinosaurs, and millipedes with the most legs. |
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It has been identified in carbonaceous achondrite and iron meteorites. |
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Deceleration of meteorites begins high in the atmosphere where the surface of the incoming body heats up to incandescence causing melting and ablation. |
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It has been observed as an uncommon accessory mineral in some contact metamorphic deposits and is reported as a rare constituent of some carbonaceous chondrite meteorites. |
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This means there are a lot of different groups and sub-types of iron meteorite and they can be related to both stony achondritic and chondrite meteorites. |
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Almost all meteorites are collisional fragments of asteroids, and can be dated radiometrically to about 4.6 billion years, which represents the birth of the Solar System. |
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Some rocks have basaltic compositions similar to the well-studied meteorites thought to have come from Mars, but other rocks are more like the volcanic rock andesite. |
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One of the things astrobiologists are interested in is trying to understand the formation of organic molecules in space, in interstellar clouds and meteorites. |
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Pallasites are the most common type of stony-irons but are rare meteorites, with probably less than one percent of all meteorites being pallasites. |
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Nickle-iron can be found in many stone meteorites in the form of small flakes or in irons and in stony-irons as large chunks or as the entire mass of the meteorite. |
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My research has largely been in the chemistry of how the particular components of chondrites, very primitive meteorites, actually formed in the solar nebula. |
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I wanted to know more about meteorites and the clues to the deeper layers of our own planet offered by the bits that they carry from the core of shattered planetoids. |
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Until then, we earthlings can continue to look for microscopic visitors, or their fossil remnants, that might reside in meteorites from Mars or from other worlds. |
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A majority of these meteorites comes from collisions in the asteroid belt between Mars and Jupiter. |
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The central desert of Oman is an important source of meteorites for scientific analysis. |
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Most of these meteorites have fallen onto the ice sheet in the last million years. |
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The body of the book is divided into three parts, covering minerals, rocks from meteorites to tektites, and fossils. |
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Geologists tend to study plate tectonics, meteorites from outer space, and resources from the breakup of the supercontinent Gondwana. |
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About 100 times as many meteorites struck the Earth per year during the Ordovician compared with today. |
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He also found troilite and another mineral, schreibersite, a phosphide of iron and nickel found in meteorites. |
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But when they analysed minerals called pyroxenes, they found that the ratio of iron to manganese did match those of other Martian meteorites. |
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Although rare, iron meteorites are the main form of natural metallic iron on the Earth's surface. |
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It is a rare component of some meteorites and has scientific importance in solar nebula research. |
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Inclusions and chondrules formed independently of meteorites and were later incorporated into them. |
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To solve the problem, we need to study a lot more comets and meteorites. |
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Much of the past work on isotopic composition of iron has focused on the nucleosynthesis of 60Fe through studies of meteorites and ore formation. |
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A plagioclase glass in some chondrites and irons formed by preterrestrial impact between meteorites in space. |
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Oceanic impacts of large meteorites are expected to have high efficiency in converting energy into seismic waves. |
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One theory is that tektites are solidified droplets of lunar material melted and splashed into space when large meteorites crashed into the moon. |
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It includes rings, necklaces, earrings, bracelets and cuffing made of gemstones, meteorites, tektite and fossils, among others. |
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Because meteorites in space absorb and record cosmic radiation, the time elapsed since the meteorite hit the Earth can be determined from laboratory studies. |
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In meteorites it occurs with troilite and silicate minerals. |
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This large collection of meteorites allows a better understanding of the abundance of meteorite types in the solar system and how meteorites relate to asteroids and comets. |
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Scientists also found telltale chemical fingerprints of pyroxene and olivine in and around the crater, two minerals that are commonly present in the Martian meteorites. |
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Astronomers think most meteorites originate in the solar system's asteroid belt, with a mineral content reflecting that of their asteroidal parents. |
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As such, iron is the most abundant element in the core of red giants, and is the most abundant metal in iron meteorites and in the dense metal cores of planets such as Earth. |
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When contacted by the GDN, the gem testing directorate said it was unable to test for tektites or meteorites and had no knowledge of any being found in Bahrain. |
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He thinks NWA 7325 could belong to a class of meteorites known as primitive achondrites, which contain chromium-rich pyroxene and are low in iron. |
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This displacement of water is usually attributed to either earthquakes, landslides, volcanic eruptions, glacier calvings or more rarely by meteorites and nuclear tests. |
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New types of meteorites and rare meteorites have been found. |
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Recently discovered quasicrystals with five sided shapes have been produced in laboratories and have been found in meteorites from outer space, www. |
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Meteorite lakes, which are also known as crater lakes, are lakes created by catastrophic extraterrestrial impacts by either meteorites or asteroids. |
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The blasters are those beams of ravening destruction which take care of recalcitrant meteorites in a spaceship's course when the deflectors can't handle them. |
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