| 单词 | chondrite |
| 例句 | Quartz and chert and schist and chondrite iron scabs in granite. Unfinished Business 2011-03-31T11:15:00Z Carbonaceous chondrites are so rare that, of the approximately 65,000 known meteorites on Earth, only 51 are carbonaceous chondrites, according to the museum. Rare meteorite with ‘ingredients for life’ found after falling on UK driveway 2021-03-10T05:00:00Z Rare meteorites called enstatite chondrites have high metal contents and Psyche-like densities, but their parent body is thought to have formed closer to the Sun. NASA launches spacecraft to a mysterious metal-rich asteroid 2023-10-13T04:00:00Z The Winchcombe meteorite belongs to a rare class of space rocks known as carbonaceous chondrites. Did Earth’s Water Come from Meteorites? 2023-07-31T04:00:00Z That led Magee and his colleagues to identify it as a chondrite, a meteorite made mostly of rock, in contrast to the iron and nickel composition of so-called iron or “ferrous” meteorites. A Meteorite Fell in Their Bedroom. Here’s What Happened Next 2023-05-25T04:00:00Z “We are excited to be able to confirm that the object is a true chondrite meteorite, in excellent condition, and one of a very small number of similar witnessed chondrite falls known to science.” Experts: Metallic object that crashed into New Jersey home was a meteorite 2023-05-11T04:00:00Z Hand magnets are effective for distinguishing ordinary chondrites, an abundant kind of meteorite that is often loaded with metals, from many Earth rocks. Magnets wipe memories from meteorites, erasing billion-year-old data 2023-04-05T04:00:00Z A close match between the isotope ratios found in noncarbonaceous chondrites and those found in the same metals on Earth suggested much of Earth’s raw material came from the same nearby region as those meteorites. Earthlike planets should readily form around other stars, meteorites suggest 2023-01-25T05:00:00Z A few months after the Winchcombe analysis came out, a study by Newcombe and her team further strengthened carbonaceous chondrites' case. Did Earth’s Water Come from Meteorites? 2023-07-31T04:00:00Z Dr. Russell said carbonaceous chondrites were thought to have formed in the outer part of the solar system, farther out than their current orbits of most asteroids. Asteroid Samples May ‘Rewrite the Chemistry of the Solar System’ 2022-06-09T04:00:00Z It's called a carbonaceous chondrite, and people in the past have proposed that that's probably what hit 66 million years ago. How paleontologists know what life on Earth was like the day the asteroid killed the dinosaurs 2022-05-11T04:00:00Z All three are classified as carbonaceous chondrites, made of rocky material thought to have formed early in the solar system’s history. Could key ingredients for life have arrived from space? Scientists say yes 2022-04-26T04:00:00Z Inside the amber, researchers identified the mineralogical signature of a type of asteroid known as a carbonaceous chondrite—not a comet, as others have suggested. News at a glance: Second boosters, climate protests, and an elusive woodpecker 2022-04-13T04:00:00Z Unlike carbonaceous chondrites, these meteorites come from asteroids or other rocky bodies that have been partially melted by radiation and geologic processes. Did Earth’s Water Come from Meteorites? 2023-07-31T04:00:00Z Of the more than 1,000 space rocks that have been found on Earth’s surface, only five are of the this type known as a C.I. chondrite. Asteroid Samples May ‘Rewrite the Chemistry of the Solar System’ 2022-06-09T04:00:00Z They either figured it was a comet or a carbonaceous chondrites. How paleontologists know what life on Earth was like the day the asteroid killed the dinosaurs 2022-05-11T04:00:00Z That mineralogy points to the presence of an asteroid, and in particular a type known as carbonaceous chondrites. Shards of Asteroid That Killed the Dinosaurs May Have Been Found in Fossil Site 2022-04-07T04:00:00Z It is probably chondrite, Chabot said, a common type of asteroid made of rock and metal rubble left over from when planets were formed 4.5 billion years ago. NASA hopes to hit an asteroid now in case we really need to knock one away later It would take an awful lot of meteorite impacts to account for the planet's oceans in chondrites alone, and carbonaceous chondrites are fairly rare today. Did Earth’s Water Come from Meteorites? 2023-07-31T04:00:00Z Roughly half of the meteorites belonged to a type known as carbonaceous chondrites, which tend to be relatively rich in carbon and water. Deflecting an asteroid before it hits Earth may take multiple bumps 2021-08-28T04:00:00Z That was an "ordinary chondrite" - a common type of space rock. Fireball meteor behind 'sonic boom' noise in south west 2021-03-21T04:00:00Z Previously, evidence from the Chicxulub crater suggested the impact object was made of carbonaceous chondrite. Why some scientists think a comet, not an asteroid, caused the dinosaurs to go extinct 2021-02-17T05:00:00Z Rocks that underwent this natural “heat treatment” process would be sturdier, and more likely to survive the passage through Earth’s atmosphere, handily explaining why most of the meteorites we find are chondrites. Asteroid Dust from Hayabusa2 Could Solve a Mystery of Planet Creation 2020-12-08T05:00:00Z Piani points out that roughly equal parts solar wind, comets, water bubbling up from the mantle and chondrites could be combined to match Earth's isotope balance. Did Earth’s Water Come from Meteorites? 2023-07-31T04:00:00Z The remainder were ordinary chondrites, which typically contain less carbon. Deflecting an asteroid before it hits Earth may take multiple bumps 2021-08-28T04:00:00Z Chunks of enstatite chondrite are still around in the solar system, and occasionally fall as meteorites. The Enduring Mystery of Earth's Water 2020-09-13T04:00:00Z “There’s nothing that predicts them,” said Rhian Jones of the University of Manchester in England, an expert in chondrites. Small Worlds With Lava Oceans Might Have Given Us Meteorites 2020-06-22T04:00:00Z And even if chondrules are not present, it could simply suggest Ryugu has been altered by water in its past, erasing any evidence of its chondrules, as with CI chondrites found on Earth. Asteroid Dust from Hayabusa2 Could Solve a Mystery of Planet Creation 2020-12-08T05:00:00Z Researchers finally hit the jackpot with asteroids—specifically, raw asteroid chunks called chondrites. Did Earth’s Water Come from Meteorites? 2023-07-31T04:00:00Z The carbonaceous chondrites tended to fragment much more readily — they could withstand receiving only about one-sixth of the momentum that the ordinary chondrites could before shattering. Deflecting an asteroid before it hits Earth may take multiple bumps 2021-08-28T04:00:00Z Now, in a work reported by Piani, et al. in the journal Science, an analysis of the composition of 13 enstatite chondrite meteorite samples reveals a much higher than expected hydrogen content. The Enduring Mystery of Earth's Water 2020-09-13T04:00:00Z They would tell us more about the nature of planetesimals in the early solar system, with chondrites being the scorched leftovers of the process that formed worlds such as Earth. Small Worlds With Lava Oceans Might Have Given Us Meteorites 2020-06-22T04:00:00Z Some chondrites are so chondrule-packed they look almost like a conglomeration of beads. Asteroid Dust from Hayabusa2 Could Solve a Mystery of Planet Creation 2020-12-08T05:00:00Z Carbonaceous chondrites, which are named for their carbon content, are up to 20 percent water. Did Earth’s Water Come from Meteorites? 2023-07-31T04:00:00Z The research, published in the journal Science Advances, analyzed different iron isotopes in dust from different meteorites and found that the profile of CI chondrites was similar to Earth's. Earth formed faster than initially believed, experts say 2020-02-26T05:00:00Z This meteorite is a carbonaceous chondrite, a supremely 'primitive' object, rich in carbon compounds. On Earth: Stardust from 7.5 Billion Years Ago 2020-01-18T05:00:00Z In particular, they looked for remnants of the huge asteroid, which geologists call the “L chondrite parent body”. Dust cloud sparked explosion in primitive life on Earth, say scientists 2019-09-18T04:00:00Z They would have solidified in the cold expanse of space after their unknown formation process, beginning their lives as molten droplets before coalescing into chondrites. Asteroid Dust from Hayabusa2 Could Solve a Mystery of Planet Creation 2020-12-08T05:00:00Z "We show that selenium isotopes record a signature of late accretion after core formation and that this signature overlaps only with that of the CI-type carbonaceous chondrites," the study's abstract states. Meteorite strikes made life on Earth possible, study says 2019-08-14T04:00:00Z At the same time, chondrites—common stony meteorites—are also peppered with rounded, shiny inclusions known as chondrules, some of which are iron-nickel rich. NASA to Seek Iron-Spewing Volcanoes at Psyche 2019-04-25T04:00:00Z Hydrated minerals mean Bennu matches to CI and CM carbonaceous chondrites, which is what the team wanted desperately to get back into laboratories on Earth. Getting the Dirt on Creation--Inside OSIRIS-REx's First Close Look at Bennu 2018-12-19T05:00:00Z Even though samples of asteroids, in particular the kind called carbonaceous chondrites, show that they contained water, it seemed that the water would be lost in the intense heat of the impacts. How Asteroids May Have Brought Water to Earth 2018-05-15T04:00:00Z Ordinary chondrites, for example, are chock full of chondrules and account for more than nine out of every 10 chondrule-containing space rocks. Asteroid Dust from Hayabusa2 Could Solve a Mystery of Planet Creation 2020-12-08T05:00:00Z "These are carbonaceous chondrites from the solar system beyond the asteroid belt, from the area of the planets Jupiter, Saturn, Uranus and Neptune." Meteorite strikes made life on Earth possible, study says 2019-08-14T04:00:00Z This is independent of the oxidation state or petrological type of the chondrites. Halogens in chondritic meteorites and terrestrial accretion 2017-11-28T05:00:00Z These leftovers fall to Earth as meteorites that scientists call “chondrites,” and they provide clues about the conditions in which the planets formed. How Earth’s hellish birth deprived us of silver and gold 2017-09-27T04:00:00Z They shot pea-sized pebbles of a rock called antigorite, similar to the material of carbonaceous chondrites, at a small sample of pumice, meant to mimic a dry earth. How Asteroids May Have Brought Water to Earth 2018-05-15T04:00:00Z This process, whatever it was, likely occurred throughout the solar system, in order to account for the large abundance of chondrules found in chondrites on Earth. Asteroid Dust from Hayabusa2 Could Solve a Mystery of Planet Creation 2020-12-08T05:00:00Z Each simulant is based on a different class of meteorites called carbonaceous chondrites, which are thought to be chunks of asteroids. Why planetary scientists want better fake space dirt 2017-07-06T04:00:00Z The chlorine isotope composition of chondrites and Earth. Halogens in chondritic meteorites and terrestrial accretion 2017-11-28T05:00:00Z Yet when it comes to moderate volatiles, Earth's composition is weirdly different from that of the chondrites. How Earth’s hellish birth deprived us of silver and gold 2017-09-27T04:00:00Z At the time, those meteorites, called L chondrites, made up 99 percent of all space rocks that landed on our planet. A 466-million-year-old space collision is still raining shrapnel on Earth 2017-01-23T05:00:00Z From there, they became embedded in larger rocks, called chondrites, which make up the majority of the roughly 64,000 meteorites that humans have discovered throughout recorded history. Asteroid Dust from Hayabusa2 Could Solve a Mystery of Planet Creation 2020-12-08T05:00:00Z Many near-Earth asteroids are abundant in carbonaceous chondrites that contain a lot of ice, says Crawford. Galactic gold rush: the tech companies aiming to make space mining a reality 2016-12-06T05:00:00Z The ratios Br/Cl and I/Cl in all studied chondrites show a limited range, indistinguishable from bulk silicate Earth estimates. Halogens in chondritic meteorites and terrestrial accretion 2017-11-28T05:00:00Z Related: Dinosaurs in decline long before asteroid catastrophe, study reveals Previously, remnants of only one of the two rocks had been found, in the form of meteorites called chondrites. Mystery alien rock unearthed in Swedish quarry 2016-06-14T04:00:00Z When this dating is done for the L chondrites and Öst 65, the exposure times line up. 'Fossil' meteorite was from asteroid smash-up - BBC News 2016-06-14T04:00:00Z Carbonaceous chondrites, which account for about 4 percent of all chondrites, have a high abundance of carbon and are very similar in composition to the sun’s surface, suggesting they formed in the inner solar system. Asteroid Dust from Hayabusa2 Could Solve a Mystery of Planet Creation 2020-12-08T05:00:00Z In particular, her findings point to asteroids with a recipe much like carbonaceous chondrites. Asteroids 'dumped water into molten Moon' - BBC News 2016-05-31T04:00:00Z Chlorine isotope homogeneity of the mantle, crust and carbonaceous chondrites. Halogens in chondritic meteorites and terrestrial accretion 2017-11-28T05:00:00Z It is thought that the breakup of the bigger chondrite body, about 100-150km across, had yielded a major cluster of rocky debris in the asteroid belt between Mars and Jupiter. Mystery alien rock unearthed in Swedish quarry 2016-06-14T04:00:00Z They compared these isotope ratios with those known for comets, a range of primitive meteorites called chondrites, and other objects in the solar system - including Earth. Water inside moon mostly from asteroids, study suggests 2016-05-31T04:00:00Z A subgroup called CI chondrites have no visible chondrules, having likely been altered by water. Asteroid Dust from Hayabusa2 Could Solve a Mystery of Planet Creation 2020-12-08T05:00:00Z For starters, the asteroids that gouged these double pockmarks into Earth are a particular type of space rock called an L chondrite—something that is rich in olivine and relatively iron-poor. Space Rocks Delivered One-Two Punch to Ancient Earth 2015-12-15T05:00:00Z Geochemistry of CI chondrites: major and trace elements, and Cu and Zn isotopes. Halogens in chondritic meteorites and terrestrial accretion 2017-11-28T05:00:00Z Along with about 100 chondrite pieces discovered to date, the new alien fragment had sunk to the floor of an ocean covering parts of what today is a limestone quarry in southern Sweden. Mystery alien rock unearthed in Swedish quarry 2016-06-14T04:00:00Z These asteroids, they add, were similar in makeup to a type of water-rich primitive meteorites known as carbonaceous chondrites. Water inside moon mostly from asteroids, study suggests 2016-05-31T04:00:00Z And CB chondrites hold a particularly unique accolade, being the only type of chondrite for which there is near-universal agreement on how they formed. Asteroid Dust from Hayabusa2 Could Solve a Mystery of Planet Creation 2020-12-08T05:00:00Z These small, preserved fragments arrived on Earth around the same time, and all except one are L chondrites. Space Rocks Delivered One-Two Punch to Ancient Earth 2015-12-15T05:00:00Z Menzies, O. N., Bland, P. A., Berry, F. J. & Cressey, G. A Mössbauer spectroscopy and X-ray diffraction study of ordinary chondrites: quantification of modal mineralogy and implications for redox conditions during metamorphism. Halogens in chondritic meteorites and terrestrial accretion 2017-11-28T05:00:00Z “The meteorite also contains high concentrations of rare isotopes of the element Neon” – and in different proportions than in chondrites. Mystery alien rock unearthed in Swedish quarry 2016-06-14T04:00:00Z Also, very different meteorites - carbonaceous chondrites that were never part of a planet - show far lower relative methane concentrations, again suggesting that the martian samples are indeed bearing methane from Mars's subsurface environment. There's Methane In Them Thar Martian Rocks! 2015-06-17T04:00:00Z Because apart from this one anomaly, the exact formation process for chondrules and chondrites remains a mystery—but not for any lack of trying. Asteroid Dust from Hayabusa2 Could Solve a Mystery of Planet Creation 2020-12-08T05:00:00Z “Knowing it’s an LL chondrite narrows the field a bit, but there are a lot of these chondrites in the near-Earth asteroid population,” said Righter. NASA Surprised By Chelyabinsk Russian Meteor Fragments 2015-03-21T04:00:00Z The authors also find that the Br/Cl and I/Cl ratios in all the chondrites studied show a limited range, indistinguishable from bulk silicate Earth estimates. Halogens in chondritic meteorites and terrestrial accretion 2017-11-28T05:00:00Z Carbonaceous chondrites are leftover from comets, never were in a planetesimal. Attention QVC Shoppers, The Moon Is A Planet 2015-01-21T05:00:00Z Almost on a whim, Piatek paid $6000 for the stone—cheap in the meteorite world—thinking it was nothing more than a regular chondrite. Feature: A castaway from ancient Mars 2014-11-25T05:00:00Z Carbonaceous chondrites formed peacefully, slowly accreting as more and more material clumped together in orbit around the infant sun. In a Grain, a Glimpse of the Cosmos 2014-06-18T04:00:00Z The meteorite is considered a chondrite, the most common type of meteorite found on Earth; scientists think these meteorites are remnants shed from the original building blocks of planets. Earth's Most Abundant, Yet Elusive, Mineral Named After Nobel Prize Winner 2014-06-17T04:00:00Z The moon rocks also contain a rare material called enstatite chondrite, which is not found on earth, also suggesting that the moon was formed by planetary coalescing. Researchers Discover Traces of the Planet That Helped Create the Moon 2014-06-06T04:00:00Z First, scientists think the composition of the Earth's mantle is similar to that of meteorites called chondrites, which are chiefly made of olivine. Rare Diamond Confirms that Earth's Mantle Holds an Ocean's Worth of Water 2014-03-12T19:58:00Z It didn’t have the heft of a chondrite, which are typically rich in dense metals. Feature: A castaway from ancient Mars 2014-11-25T05:00:00Z “You don’t find carbonaceous chondrites with evidence of shock,” Hollister said — at least, never with battle wounds nearly this extreme. In a Grain, a Glimpse of the Cosmos 2014-06-18T04:00:00Z It was proposed that the moon and Earth had been battered by iridium-rich meteorites, known as chondrites, from outer space. Does gold come from outer space? 2013-09-19T01:26:09Z The team, led by Urals Federal University's Viktor Grokhovsky, determined right away that the overall chemistry of the meteorite was a familiar "chondrite". Meteor's debris seen close up 2013-07-12T17:00:33Z "These are classified as ordinary chondrites, or stony meteorites, with an iron content of about 10 percent," he told RIA news agency. "Meteorite rush" begins as Russian scientists find fragments 2013-02-18T11:14:25Z The vast majority are chondrites, pieces of asteroids filled with little glassy beads called chondrules. Feature: A castaway from ancient Mars 2014-11-25T05:00:00Z Sure enough, the rock had the oxygen fingerprint of a meteorite, and a rare and old kind, too: a CV3 carbonaceous chondrite. In a Grain, a Glimpse of the Cosmos 2014-06-18T04:00:00Z One of these studies, from the University of Maryland, found less resemblance than expected between the Earth's rocks and chondrites - the iridium-rich meteorites. Does gold come from outer space? 2013-09-19T01:26:09Z Various features in chondrites offer clues to how much dust was present in their particular corners of space. Fall That Glitters: Microscopy Reveals Stained-Glass Beauty in Ancient Meteorites [Slide Show] 2013-01-23T13:15:00.190Z When we examine thin slices from chondrites under a microscope, they become beautiful to behold, not unlike some of the paintings by Wassily Kandinsky and other abstract artists. What the Oldest Meteorites Say about the Early Solar System (preview) 2013-01-23T12:15:00.983Z It also permeates the ancient material of our solar system that we see preserved in carbonaceous chondrite meteorites and cometary contents. Should We Expect Other Earth-like Planets At All? 2012-12-26T20:15:00.430Z But according to MacPherson, a leading expert on carbonaceous chondrites, the Florence sample was like none other known to science, even discounting the presence of quasicrystals. In a Grain, a Glimpse of the Cosmos 2014-06-18T04:00:00Z The recovered chunks revealed the Sutter’s Mill meteorite to be a rare variety called a carbonaceous chondrite. California Meteor Broke Speed Record for Atmospheric Entry 2012-12-20T23:45:03.167Z We would probably choose a fairly rare type of ordinary chondrite, known as an LL chondrite, that may contain as little as 1 to 3% metal but which is quite rich in PGMs. Forex Manna From Heaven: Space-Mining And The Peak-Metal Crunch 2012-05-28T10:21:50Z The asteroidal fragments that fascinate me most are the chondrites. What the Oldest Meteorites Say about the Early Solar System (preview) 2013-01-23T12:15:00.983Z "This is the first time that a different composition in isotopes is observed for a major element between the enstatite chondrites and the Earth," Fitoussi told SPACE.com. Earth Formed from Diverse Meteorite Mix 2012-03-02T18:15:00.257Z It was found entwined with a silica mineral that forms only at high pressures and temperatures—such as might be created by a collision with the chondrite body. World's Only Known Natural Quasicrystal Traced to Ancient Meteorite 2012-01-03T21:45:21.237Z That low-density exterior material, which resembles that of primitive meteorites known as chondrites, is tough to reconcile with the asteroid's high overall density, which exceeds that of most chondrites. Hard Rock: Asteroid Lutetia May Be an Intact Leftover from Planetary Formation 2011-10-28T21:45:05.277Z One hundred parts per million or more is possible in a metallic asteroid or in the metal portions of LL chondrite asteroids. Forex Manna From Heaven: Space-Mining And The Peak-Metal Crunch 2012-05-28T10:21:50Z Until recently, scientists believed that the Earth's primitive mantle, such as the remnants found in northern Canada and Greenland, originated from a type of meteorite called carbonaceous chondrites. Reservoirs of Ancient Lava Shaped Earth 2011-07-29T13:07:00Z The results suggest that a mixture of chondrites, rather than enstatite chondrites alone, probably combined to create the Earth. Earth Formed from Diverse Meteorite Mix 2012-03-02T18:15:00.257Z The ratios of isotopes of oxygen in silicate and oxide minerals around the quasicrystal grain are typical of minerals found in meteorites called carbonaceous chondrites, the team reports. World's Only Known Natural Quasicrystal Traced to Ancient Meteorite 2012-01-03T21:45:21.237Z Allende is the largest carbonaceous chondrite meteorite ever found on Earth. Oldest Objects in Solar System Indicate a Turbulent Beginning 2011-03-07T20:00:00Z She claims the meteorite provides better evidence of the possible "prebiotic" role played by meteorites than the "Murchison" group of carbonaceous chondrites. Meteorite 'may have sparked life' 2011-02-28T22:34:20Z Krypton in today's atmosphere is somewhat heavier than solar krypton, and the krypton embedded in meteorites known as carbonaceous chondrites is even heavier than that. Subsurface Gas Deposit Could Deflate Theory of How Earth's Atmosphere Formed 2011-01-10T07:45:41.173Z However, carbonaceous chondrites would have delivered not only water but also other compounds and elements that would not have condensed in the heat of the early solar disk. Earth contains a vast amount of water, but scientists are unsure of its origins 2010-11-08T21:10:00Z This indicates that the rock is of extraterrestrial origin and very old: virtually all chondrites formed at the birth of the Solar System. World's Only Known Natural Quasicrystal Traced to Ancient Meteorite 2012-01-03T21:45:21.237Z In the samples of mantle gas taken by Holland and his colleagues, the krypton measurements were heavy, producing "something that looks rather like gases that are trapped in primitive chondrites today," Pepin says. Subsurface Gas Deposit Could Deflate Theory of How Earth's Atmosphere Formed 2011-01-10T07:45:41.173Z Those compounds and elements include gases such as argon, krypton and xenon, and the proportions of those elements in carbonaceous chondrites don't match what's found on Earth. Earth contains a vast amount of water, but scientists are unsure of its origins 2010-11-08T21:10:00Z |
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