Trace amounts of glycine, serine, and alanine were detected in the carbonate component of the martian meteorite ALH84001 by high-performance liquid chromatography. The detected amino acids were not uniformly distributed in the carbonate component and ranged in concentration from 0.1 to 7 parts per million. Although the detected alanine consists primarily of the L enantiomer, low concentrations (|0.1 parts per million) of endogenous D-alanine may be present in the ALH84001 carbonates. The amino acids present in this sample of ALH84001 appear to be terrestrial in origin and similar to those in Allan Hills ice, although the possibility cannot be ruled out that minute amounts of some amino acids such as D-alanine are preserved in the meteorite.
Isotopic Evidence for Extraterrestrial Non-Racemic Amino Acids in the Murchison MeteoriteJournal article By: Michael H. Engel and Stephen A. MackoDate: September 18, 1997Source: Engel, Michael H. and Stephen A. Macko. Isotopic Evidence for Extraterrestrial Non-Racemic Amino Acids in the Murchison Meteorite. Nature 389 (September 18, 1997): 265. Source for information on Isotopic Evidence for Extraterrestrial Non-Racemic Amino Acids in the Murchison Meteorite: Environmental Issues: Essential Primary Sources dictionary.
The whole question of the biochemistry is: were the organic compounds definitely in the meteorite before it landed? Also, how many different kinds of compounds were there? The details below answer these questions as: Q1 yes; Q2 very many.. This type of meteorite is rich in carbon and among the most chemically primitive meteorites.[2] Murchison contains over 15 amino acids.[3] All the amino acids found in the Murchison meteorite have been synthesised in laboratory experiments by the action of electric discharge on a mixture of methane, nitrogen, and water with traces of ammonia.[3]. The amino acids were mostly racemic. This means the chirality of their enantiomers are almost equally left- and right-handed, which suggests they are not caused by terrestrial contamination. A complex mixture of alkanes was isolated as well, similar to that found in the Miller-Urey experiment. Serine and threonine, often earthly contaminants, were absent from the samples.. In 1997 research showed that individual ...
This bachelor thesis consists of two parts. The first part consists of a review of the theoretical background. It starts off with a shorter review on theories of the history of the early Solar System, from protostellar evolution to grain agglomeration. This is then followed by a brief summary of different kinds of meteorites, what their origins might be and the radiometric dating techniques used to determine their ages.. The second part of the thesis consists of an investigation of the possible forming times of the early planetesimals by computer simulation. These planetesimals can later become the parent bodies for iron-rich meteorites. Factors studied are ambient temperature and the abundance of the short-lived radioactive isotope 26Al in the forming nebula.. The study found that the parent bodies of iron meteorites had to accrete within the first few million years after the earliest solids in the Solar System, the CAI. It also found that changes in the studied boundary conditions did extend ...
According to one version of the "panspermia" theory, life on Earth could originally have arrived here by way of meteorites from Mars, where conditions early in the history of the solar system are thought to have been more favorable for the creation of life from nonliving ingredients. The only problem has been how a meteorite could get blasted off of Mars without frying any microbial life hitching a ride.. But new research on the celebrated Martian meteorite ALH84001 shows that the rock never got hotter than 105 degrees Fahrenheit during its journey from the Red Planet to Earth, even during the impact that ejected it from Mars, or while plunging through Earths atmosphere before landing on Antarctic ice thousands of years ago.. In the October 27 issue of the journal Science, Caltech graduate student Benjamin Weiss, undergraduate student Francis Macdonald, geobiology professor Joseph Kirschvink, and their collaborators at Vanderbilt and McGill universities explain results they obtained when ...
Article first published online: 8 SEP 2015. LINK. "The CI1 Orgueil meteorite is a highly aqueously altered carbonaceous chondrite. It has been extensively studied, and despite its extensive degree of aqueous alteration and some documented instances of contamination, several indigenous organic compounds including amino acids, carboxylic acids, and nucleobases have been detected in its carbon-rich matrix. We recently developed a novel gas chromatographic method for the enantiomeric and compound-specific isotopic analyses of meteoritic aliphatic monoamines in extracts and have now applied this method to investigate the monoamine content in Orgueil. We detected 12 amines in Orgueil, with concentrations ranging from 1.1 to 332 nmol g−1 of meteorite and compared this amine content in Orgueil with that of the CM2 Murchison meteorite, which experienced less parent-body aqueous alteration. Methylamine is four times more abundant in Orgueil than in Murchison. As with other species, the amine content in ...
CI chondrites, sometimes C1 chondrites, are a group of rare stony meteorites belonging to the carbonaceous chondrites. Samples have been discovered in France, Canada, India, and Tanzania. Compared to all the meteorites found so far, their chemical composition most closely resembles the elemental distribution in the suns photosphere. The abbreviation CI is derived from the C for carbonaceous and from the I for Ivuna, the type locality in Tanzania. The 1 in C1 stands for the type 1 meteorites in the classification scheme of Van Schmus-Wood. Type 1 meteorites normally have no recognizable chondrules. There are very few finds of CI chondrites, six so far altogether. The oldest find dates back to the year 1806: two meteorites were seen near Alès (or Alais) in France. Consequently, two pieces weighing 6 kilograms were discovered at Saint-Étienne-de-lOlm and Castelnau-Valence, small villages S-E of Alès. In 1864 another fall happened in France at Orgueil near Montauban. The meteorite had ...
The variability of these constituents, not only from one chondrite to another but also within the same chondrite, is no trivial detail. An originating nebula of dust and gas would be expected to have been homogeneous over medium-scale distances. Assuming that the solar system came from such a nebula, one has to excuse the variability by supposing that, for example, the separate classes of chondrules were derived from separate regions and that mixing subsequent to chondrule formation was not thorough (Taylor 2001). That is, the chondrules accreted very quickly, before differences in their composition could be smoothed out.. CAIs and chondrules commonly include the decay products of several extinct, very short-lived radioactive elements such as iron-60 (written as 60Fe, a neutron-rich isotope of iron) and aluminium-26 (26Al), and it is these that enable a remarkably precise chronology for the early solar system to be determined. The very oldest constituents are the CAIs. Dating to 4,568 million ...
Jones R. H., Grossman J. N., and Rubin A. E. 2005. Chemical, mineralogical and isotopic properties of chondrules: Clues to their origin. In Chondrites and the protoplanetary disk, edited by Krot A. N., Scott E. R. D., and Reipurth B. ASP Conference Series Proceedings, vol. 341. San Francisco: Astronomical Society of the Pacific. pp. 251-281 ...
NWA 2737, a Martian meteorite from the Chassignite subclass, contains minute amounts (0.010 ± 0.005 vol%) of metal-saturated Fe-Ni sulfides. These latter bear evidence of the strong shock effects documented by abundant Fe nanoparticles and planar defects in Northwest Africa (NWA) 2737 olivine. A Ni-poor troilite (Fe/S = 1.0 ± 0.01), sometimes Cr-bearing (up to 1 wt%), coexists with micrometer-sized taenite/tetrataenite-type native Ni-Fe alloys (Ni/Fe = 1) and Fe-Os-Ir-(Ru) alloys a few hundreds of nanometers across. The troilite has exsolved flame-like pentlandite (Fe/Fe + Ni = 0.5-0.6). Chalcopyrite is almost lacking, and no pyrite has been found. As a hot desert find, NWA 2737 shows astonishingly fresh sulfides. The composition of troilite coexisting with Ni-Fe alloys is completely at odds with Chassigny and Nahkla sulfides (pyrite + metal-deficient monoclinic-type pyrrhotite). It indicates strongly reducing crystallization conditions (close to IW), several log units below the fO2 conditions ...
redOrbit Staff & Wire Reports - Your Universe Online. Scientists attempting to better understand the formation and the present-day layering of planet Earth have turned to ancient meteorites -- meteorites which they say could hold important clues to some of the Solar Systems earliest chemical processes.. Those meteorites are known as diogenites, and researchers from the Carnegie Institution, the Scripps Institution of Oceanography, and the University of Maryland studied nine samples (seven from Antarctica and two from the African desert).. Diogenites, they explained, may have come from the asteroid Vesta and are among the Solar Systems oldest remaining examples of heat-related chemical processing, Carnegie officials said in a recent statement.. "Whats more, Vesta or their other parent bodies were large enough to have undergone a similar degree of differentiation to Earth, thus forming a kind of scale model of a terrestrial planet," they said. "They were able to confirm that these samples came ...
Alice (3) alien gold (2) Geyser (1) Golden Age of Dinosaur Discovery (1) Death by GPS (1) Diggers episode (1) Elko Crater Field Nevada (1) Geology of Northern Arizona (1) Holocene crater (2) Magician of the Gods" (1) Piltdown Fly (1) The Cloud - Great Ted Talk About Being A Scientist (1) Uranolithe fosslie Astronomie. vol. 7 p. 114 (1888) (1) War of the Worlds (1) "Flood Debris (1) "mega meteorite crater" (1) "Meteorite" sickness (1) "Sailing Stones" (1) " and Crater in the Gulf of Mexico (1) (Anomaly) Disputed (1) (Art) (1) (Online) (1) $2 million in gems (1) 000 (1) 000 Trained Geoscientists Predicted (1) 000 Year-old Giant Virus (1) 000-Year-Old (1) 1/5 (1) 10 Tons of Meteorites (1) 10/6 (1) 11500 BP (1) 12-year-old Boy (1) 124 miles in Diameter (1) 12th (1) 1490 Ching-yang (1) 14C (1) 14C Impacts (1) 177 Ounce (1) 1807 Meteorite Fall (1) 1908: The Tunguska Event (1) 1946) (1) 1954 Alabama Meteorite Strike (1) 1955 (1) 2 billion years (1) 2 million-year-old (1) 2.5 ...
Alice (3) alien gold (2) Geyser (1) Golden Age of Dinosaur Discovery (1) Death by GPS (1) Diggers episode (1) Elko Crater Field Nevada (1) Geology of Northern Arizona (1) Holocene crater (2) Magician of the Gods" (1) Piltdown Fly (1) The Cloud - Great Ted Talk About Being A Scientist (1) Uranolithe fosslie Astronomie. vol. 7 p. 114 (1888) (1) War of the Worlds (1) "Flood Debris (1) "mega meteorite crater" (1) "Meteorite" sickness (1) "Sailing Stones" (1) " and Crater in the Gulf of Mexico (1) (Anomaly) Disputed (1) (Art) (1) (Online) (1) $2 million in gems (1) 000 (1) 000 Trained Geoscientists Predicted (1) 000 Year-old Giant Virus (1) 000-Year-Old (1) 1/5 (1) 10 Tons of Meteorites (1) 10/6 (1) 11500 BP (1) 12-year-old Boy (1) 124 miles in Diameter (1) 12th (1) 1490 Ching-yang (1) 14C (1) 14C Impacts (1) 177 Ounce (1) 1807 Meteorite Fall (1) 1908: The Tunguska Event (1) 1946) (1) 1954 Alabama Meteorite Strike (1) 1955 (1) 2 billion years (1) 2 million-year-old (1) 2.5 ...
The aqueously altered chondritic parent bodies were initially composed of icy dust containing silicates, and the ices mainly contained H2O, CO, and CO2 with some formaldehyde and ammonia (21). Decay of radioactive nuclides (most likely 26Al) and/or the occurrence of transient events, such as impact shocks (26), could have produced heat that melted the ices contained in the planetesimals to produce liquid water (27). The conditions of the aqueous alteration have been estimated to be 0° to 80°C (pH 6 to 12) for CM2 chondrites, 20° to 150°C (pH 7 to 10) for CI1 chondrites, ~120°C for CM1 chondrites, 50° to 150°C for CR chondrites, 0° to 340°C for CO and CV chondrites, and up to 260°C for ordinary chondrites (15), although these temperatures are rather uncertain. These warm and slightly alkaline conditions are preferable for the formose reaction to occur (28), and further condensation and carbonization produced complex macromolecular organic solids (5, 16). As shown in the present study, ...
Achondrite, any stony meteorite containing no chondrules (small, roughly spherical objects that formed in the solar nebula). The only exclusions are carbonaceous chondrites of the CI group, which, though they are clearly chondrites, are so heavily altered by water that any evidence for their having
Meteorites that fell from an asteroid impact that lit up the skies over California and Nevada in April are showing scientists just how complex an asteroid surface can be. A new study published in Science by an international team of researchers describes the speedy recovery of the meteorites and reports that this space rock is an unusual example from a rare group known as carbonaceous chondrites, which contain some of the oldest material in the solar system.
Version of Record online: 14 FEB 2017. LINK. "The formation of the high-pressure compositional equivalents of olivine and pyroxene has been well-documented within and surrounding shock-induced veins in chondritic meteorites, formed by crystallization from a liquid- or solid-state phase transformation. Typically polycrystalline ringwoodite grains have a narrow range of compositions that overlap with those of their olivine precursors, whereas the formation of iron-enriched ringwoodite has been documented from only a handful of meteorites. Here, we report backscattered electron images, quantitative wavelength-dispersive spectrometry (WDS) analyses, qualitative WDS elemental X-ray maps, and micro-Raman spectra that reveal the presence of Fe-rich ringwoodite (Fa44-63) as fine-grained (500 nm), polycrystalline rims on olivine (Fa24-25) wall rock and as clasts engulfed by shock melt in a previously unstudied L5 chondrite, Dhofar 1970. Crystallization of majorite + magnesiowüstite in the vein interior ...
One of the main problems when generating hypotheses on the formation and evolution of objects in the Solar System is the lack of samples that can be analysed in the laboratory, where a large suite of tools are available and the full body of knowledge derived from terrestrial geology can be brought to bear. Direct samples from the Moon, asteroids and Mars are present on Earth, removed from their parent bodies and delivered as meteorites. Some of these have suffered contamination from the oxidising effect of Earths atmosphere and the infiltration of the biosphere, but those meteorites collected in the last few decades from Antarctica are almost entirely pristine. The different types of meteorites that originate from the asteroid belt cover almost all parts of the structure of differentiated bodies: meteorites even exist that come from the core-mantle boundary (pallasites). The combination of geochemistry and observational astronomy has also made it possible to trace the HED meteorites back to a ...
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We measured maps of atmospheric water (H2O) and its deuterated form (HDO) across the martian globe, showing strong isotopic anomalies and a significant high deuterium/hydrogen (D/H) enrichment indicative of great water loss. The maps sample the evolution of sublimation from the north polar cap, revealing that the released water has a representative D/H value enriched by a factor of about 7 relative to Earths ocean [Vienna standard mean ocean water (VSMOW)]. Certain basins and orographic depressions show even higher enrichment, whereas high-altitude regions show much lower values (1 to 3 VSMOW). Our atmospheric maps indicate that water ice in the polar reservoirs is enriched in deuterium to at least 8 VSMOW, which would mean that early Mars (4.5 billion years ago) had a global equivalent water layer at least 137 meters deep.. ...
A NASA team analyzing meteorite fragments that fell on a frozen lake in Canada says its actually caused by liquid water inside an asteroid, making the search for extraterrestrial life more tricky.. "Our analysis of the amino acids in meteorite fragments from Tagish Lake gave us one possible explanation for why all known life uses only left-handed versions of amino acids to build proteins," says Dr Daniel Glavin of NASAs Goddard Space Flight Center.. Amino acid molecules come in two forms which are mirror images of each other. Life on Earth is based on so-called left-handed versions - but theres no reason why right-handed versions wouldnt work perfectly well.. All ordinary methods of synthetically creating amino acids result in equal mixtures of left- and right-handed amino acids. This leaves the question open as to how the left-handed versions came to predominate from what were presumably once equal quantities of left and right molecules.. In January, 2000, a large meteoroid exploded in the ...
Guy Consolmagno SJ (Vatican Observatory) and Daniel Britt (University of Tennessee) have made numerous measurements of the densities and porosities of meteorites. This requires measuring the total volume of a meteorite, then the total volume of grains in the meteorite. The difference between the two gives the volume of empty spaces.. Measuring the Total Volume and Density of a Meteorite. Long ago, the famous mathematician Archimedes (287-212 BC) determined how to measure the volume of an object. He showed that the volume of a rock, for example, could be measured easily by immersing it in water in a calibrated beaker. The level of the water will rise because the rock displaces a volume of water equal to the rocks volume. We have all noticed this when getting into a bathtub-the level of the water rises. If you measured the amount that the water level rose and then got out and weighed yourself, you could calculate your density. (This could be disturbing, however, because the lower your density the ...
This heavy 14k rose gold mans ring is inlaid with a raised piece of Gibeon meteorite. The meteorite has been etched with nitric acid to reveal the characteristic patterns, or Widmanstatten figures, of iron meteorites. This creates a stunning contrast to the rich color of the rose gold. Additionally, the Meteorite is cut to project above the top of the ring, giving it an attractive three dimensional effect. The ring weighs 17 grams total, is 9mm wide at top of the band, tapering to 7mm at the bottom, and is a size 11.75. It cannot be sized, but can be custom made in any size.. ...
When you hear the term "contagious disease," what tends to come to mind? Perhaps its images of red-faced, watery-eyed people coughing, sneezing and rasping around in a public space when they should be home, resting in bed. Or maybe its the unpleasant memories of a firsthand experience with a bout of whooping cough, chickenpox or streptococcal pharyngitis (better known as strep throat).. What you probably did not think of was cancer.. However, there are in fact three types of contagious cancers, spread by the transfer of living cancer cells between organisms, which are currently known to exist in nature. These cancers can be found in domestic dogs, soft-shell clams and Tasmanian devils-with additional unknown strains likely occurring in other species. And its become the mission of Watson School of Biological Science 07 alumna Dr. Elizabeth Murchison to uncover and understand both their molecular mechanisms and evolutionary histories.. "My focus is to investigate how these cancers became ...
Significant abundances of trapped argon, krypton, and xenon have been measured in shock-altered phases of the achondritic meteorite Elephant Moraine 79001 from Antarctica. The relative elemental abundances, the high ratios of argon-40 to argon-36 (≥ 2000), and the high ratios of xenon-129 to xenon-132 (≥ 2.0) of the trapped gas more closely resemble Viking data for the martian atmosphere than data for noble gas components typically found in meteorites. These findings support earlier suggestions, made on the basis of geochemical evidence, that shergottites and related rare meteorites may have originated from the planet Mars. ...
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Longstanding objections. Grossman and Melosh are well-versed in the longstanding objections to an impact origin for chondrules. "Ive used many of those arguments myself," Melosh said.. Grossman re-evaluated the theory after Conel Alexander at the Carnegie Institution of Washington and three of his colleagues supplied a missing piece of the puzzle. They discovered a tiny pinch of sodium-a component of ordinary table salt-in the cores of the olivine crystals embedded within the chondrules.. When olivine crystallizes from a liquid of chondrule composition at temperatures of approximately 2,000 degrees Kelvin (3,140 degrees Fahrenheit), most sodium remains in the liquid if it doesnt evaporate entirely. But despite the extreme volatility of sodium, enough of it stayed in the liquid to be recorded in the olivine, a consequence of the evaporation suppression exerted by either high pressure or high dust concentration. According to Alexander and his colleagues, no more than 10 percent of the sodium ...
I have to say (and it saddens me to say this) that this is part-and-parcel of scientific debate. Every field of science has its topics that generate a surprising amount of acrimony. To give another example... If youve tuned in to the life-on-Mars debate, youll know that central to this debate is a certain Martian meteorite (ALH84001) found on Antarctica. This meteorite, which is of undoubted Martian origin, contains microscopic crystals of magnetite that are of a shape and size uncannily similar to those produced biogenically by certain bacteria on Earth. The debate over whether the magnetite contained in the Martian meteorite is indeed biogenic (and therefore indicative of past or present life on the Red Planet) is one of the most heated debates I have seen. (I have heard that some scientists are no longer on speaking terms ...
A historic puzzle concerned the source of energy that can maintain the optical supernova glow for months. Although the energy that disrupts each type of supernovae is delivered promptly, the light curves are dominated by subsequent radioactive heating of the rapidly expanding ejecta. Some have considered rotational energy from the central pulsar. The ejecta gases would dim quickly without some energy input to keep it hot. The intensely radioactive nature of the ejecta gases, which is now known to be correct for most supernovae, was first calculated on sound nucleosynthesis grounds in the late 1960s.[98] It was not until SN 1987A that direct observation of gamma-ray lines unambiguously identified the major radioactive nuclei.[99]. It is now known by direct observation that much of the light curve (the graph of luminosity as a function of time) after the occurrence of a Type II Supernova, such as SN 1987A, is explained by those predicted radioactive decays. Although the luminous emission consists ...
The Murchison meteorite is among the best-studied meteorites and shows monocarboxylic acids at 332 parts per million; amino acids at a concentration of about 60 ppm; sugar-related compounds at 60 ppm; urea at 25 ppm; alcohols, aldehydes, and ketones at 11 to 16 ppm each; purines at 1.2 ppm; pyrimidines (uracil and thymine) at 0.06 ppm; and a zoo of other minority constituents. The fact that many of the amino acids discovered in meteorites do not occur in proteins has been taken as evidence of an abiotic source chemistry. Also, the fact that the meteors chiral amino acids tend to occur in racemic mixtures (with no enantiomeric excess of L- over D-forms) has been taken as evidence of abiotic chemistry, although this view should be tempered by the finding that on earth, D-enantiomers in natural sediments tend to increase in concentration with the age of the sediment. (In other words, as sediments age, natural racemization tends to even out the ratios of D- and L- amino acids.) Also, it should be ...
The Murchison meteorite is among the best-studied meteorites and shows monocarboxylic acids at 332 parts per million; amino acids at a concentration of about 60 ppm; sugar-related compounds at 60 ppm; urea at 25 ppm; alcohols, aldehydes, and ketones at 11 to 16 ppm each; purines at 1.2 ppm; pyrimidines (uracil and thymine) at 0.06 ppm; and a zoo of other minority constituents. The fact that many of the amino acids discovered in meteorites do not occur in proteins has been taken as evidence of an abiotic source chemistry. Also, the fact that the meteors chiral amino acids tend to occur in racemic mixtures (with no enantiomeric excess of L- over D-forms) has been taken as evidence of abiotic chemistry, although this view should be tempered by the finding that on earth, D-enantiomers in natural sediments tend to increase in concentration with the age of the sediment. (In other words, as sediments age, natural racemization tends to even out the ratios of D- and L- amino acids.) Also, it should be ...
The Murchison meteorite is among the best-studied meteorites and shows monocarboxylic acids at 332 parts per million; amino acids at a concentration of about 60 ppm; sugar-related compounds at 60 ppm; urea at 25 ppm; alcohols, aldehydes, and ketones at 11 to 16 ppm each; purines at 1.2 ppm; pyrimidines (uracil and thymine) at 0.06 ppm; and a zoo of other minority constituents. The fact that many of the amino acids discovered in meteorites do not occur in proteins has been taken as evidence of an abiotic source chemistry. Also, the fact that the meteors chiral amino acids tend to occur in racemic mixtures (with no enantiomeric excess of L- over D-forms) has been taken as evidence of abiotic chemistry, although this view should be tempered by the finding that on earth, D-enantiomers in natural sediments tend to increase in concentration with the age of the sediment. (In other words, as sediments age, natural racemization tends to even out the ratios of D- and L- amino acids.) Also, it should be ...
The Murchison meteorite is among the best-studied meteorites and shows monocarboxylic acids at 332 parts per million; amino acids at a concentration of about 60 ppm; sugar-related compounds at 60 ppm; urea at 25 ppm; alcohols, aldehydes, and ketones at 11 to 16 ppm each; purines at 1.2 ppm; pyrimidines (uracil and thymine) at 0.06 ppm; and a zoo of other minority constituents. The fact that many of the amino acids discovered in meteorites do not occur in proteins has been taken as evidence of an abiotic source chemistry. Also, the fact that the meteors chiral amino acids tend to occur in racemic mixtures (with no enantiomeric excess of L- over D-forms) has been taken as evidence of abiotic chemistry, although this view should be tempered by the finding that on earth, D-enantiomers in natural sediments tend to increase in concentration with the age of the sediment. (In other words, as sediments age, natural racemization tends to even out the ratios of D- and L- amino acids.) Also, it should be ...
The export option will allow you to export the current search results of the entered query to a file. Different formats are available for download. To export the items, click on the button corresponding with the preferred download format. By default, clicking on the export buttons will result in a download of the allowed maximum amount of items. To select a subset of the search results, click "Selective Export" button and make a selection of the items you want to export. The amount of items that can be exported at once is similarly restricted as the full export. After making a selection, click one of the export format buttons. The amount of items that will be exported is indicated in the bubble next to export format. ...
NASA research on a meteorite has provided new evidence that the inner planets formed from materials spread far and wide in the early solar system, and not just from nearby matter.
The meteorite collection goes back to the earliest history of the Museum. The first meteorite in the collection was a 46g piece of the Searsmont (H5 ordinary chondrite) donated in 1872 by Mr. G.M. Brainerd of Rockville, Maine.
One nitrogen atom, three hydrogen atoms. Thats all it takes to make the basic ammonia molecule. This simple compound was one of the most important building blocks for the origin of life, scientists believe, providing the nitrogen that is crucial to many organic compounds. They just dont know for sure how so much of it could form under the conditions of the early Earth.. In a new study this week, Sandra Pizzarello and colleagues tie the ammonia surplus to one of the more fascinating theories about the rise of life-that some of its basic components seeded the Earth from space on board meteorites that pounded the planets surface.. Pizzarellos team analyzed a particular meteorite found in Antarctica. Its name is Graves Nunataks (GRA) 95229, and it was discovered in 1995. But its important characteristic is that the it belongs to a class of meteorites called carbonaceous chondrites that are full of organic materials. In the lab, the researchers tried to simulate how those materials in GRA 95299 ...
Source: Asterank. Asterank includes important data such as asteroid mass, composition, and estimates of the costs and rewards of mining specific asteroids. Asterank was created and is maintained by Ian Webster. The firm Planetary Resources acquired Asterank in May 2013.. Once youve determined your target asteroid, you can plan to fetch it with the help of the 2012 "Asteroid Retrieval Feasibility Study" by the Keck Institute for Space Studies, which you can download from the following link:. http://www.kiss.caltech.edu/study/asteroid/asteroid_final_report.pdf. Planetary Resources business focus is on Earth observation and asteroid prospecting. You can read about the technologies they currently are developing to support asteroid prospecting at the following link:. http://www.planetaryresources.com/asteroids/#asteroids-intro. As noted by Planetary Resources, "near-Earth asteroids are the "low hanging fruit of the Solar System." Their website identified eight candidate targets of interest.. With ...
The asteroid fell about 50,000 years ago.[3] The meteorites have been known and collected since the mid-19th century and were known and used by pre-historic Native Americans. The Barringer Crater, from the late 19th to the mid-20th century, was the center of a long dispute over the origin of craters that showed little evidence of volcanism. That debate was settled in 1960, thanks to Eugene Shoemakers study of the crater.[4] In 1953, Clair Cameron Patterson measured ratios of the lead isotopes in samples of the meteorite. The result permitted a refinement of the estimate of the age of the Earth to 4.550 billion years (± 70 million years).[5] ...
Many theories have been presented to explain the origin of life: Some claim that life is of extraterrestrial origin, some believe that life began in the atmosphere, and some hold that the sea is the cradle of life. In all cases, however, amino acids are said to be the source of life.. Some meteorites that collided with the earth after a long journey from the remotest corner of the universe contained amino acids. Trace amounts of glycine, alanine, glutamate and alanine were detected in a meteorite that struck Murchison (Australia) in 1969. The amino acids in meteorites are considered to be a trace of life elsewhere in the universe. A trilobite fossil dating back 500 million years was found to contain the amino acid alanine. Science continues its search for an answer to the intriguing mystery of the origin of life by studying the amino acids detected in fossils and meteorites.. Well it makes proud to tell you all that we are having 20 amino acids in potentise form in all our Nanosolutions ...
Asteroids, Comets and Meteoroids are all relatively small objects that inhabit our Solar System. When any of them have orbits that intersect with that of the Earth they are known as Near Earth Objects or NEOs. Asteroids (a word coined by William Herschel [1738-1822]) used to be known as minor planets, while meteoroids is the name applied to asteroids that are less than 50 metres in diameter, although some use 10 metres as the classification threshold.. Meteorites have had a history of being considered divine in origin, leading to different levels of veneration in various cultures(v). In the 2nd century, Clement of Alexandria is said to have concluded that "the worship of such stones to have been the first, and earliest idolatry, in the world.". What is probably the first recorded death from a meteorite strike took place in India in February 2016(z).. Comets, until recently, were generally thought to be composed of just dust and ice, dirty snowballs, which have orbits that periodically bring ...
Recent work suggests a link between chiral asymmetry in the amino acid iso-valine extracted from the Murchison meteorite and the extent of hydrous alteration. We present the results of neutron scattering experiments on an exchanged, 1-dimensionally ordered n-propyl ammonium vermiculite clay. The vermiculite gel has a (001) d-spacing of order 5nm at the temperature and concentration of the experiments and the d-spacing responds sensitively to changes in concentration, temperature and electronic environment. The data show that isothermal addition of D-histidine or L-histidine solutions produces shifts in the d-spacing that are different for each enantiomer. This chiral specificity is of interest for the question of whether clays could have played an important role in the origin of biohomochirality ...
The Murchiston meteorite has revealed presolar stardust grains that are 7 billion years old - before the solar system came into being.
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The meteorites impact caused such a tremor that it awoke the residents of Molina de Segura, a town in the lowlands of Murcia that is today home to around 65,000 inhabitants. "Many people who had been asleep were awoken and all of them, except those who had seen the phenomenon outside, believed it was one of the storms that are so common in the area, and were filled with fear," continues the report. Many of those making statements said they had heard a loud noise "like canon fire", accompanied by a shuddering of the earth "like that caused by an earthquake".. Some people who were curious went to the site of the impact a few days later "and they were all confused, without knowing what could have caused it". After moving the soil a little, and finding nothing, they "completely forgot" the event. Later, "during the barley harvest", one of the workers noticed a hole caused by the meteorite "and upon digging around with his sickle hit something hard, and he told his fellow workers", whose curiosity ...
The mid-infrared spectra (4000-500 cm-1, i.e., 2.5-20 micron) of 27 stones from the Almahata Sitta meteorite fall are presented. Samples were prepared as standard KBr pellets with a 1:100 ratio of meteorite to KBr; typical meteorite samples were ~1-3 mg. Spectral profiles are dominated by a 10 micron SiO adsorption feature indicative of pyroxenes and olivines. These data are largely consistent with previous measurements of ureilites at these wavelengths [1]. The ratio of olivine to pyroxene varies from one stone to the next, and even between multiple samples of the same stone in some instances. Almahata Sitta has been classified as an anomalous polymict ureilite based on the extensive initial studies of a few meteorite fragments [2]. The spectra presented support this assessment and provide further insight into the bulk mineral composition of the meteorite. References: [1] Sandford, S.A. (1993) Meteoritics 28, 579-585; [2] Jenniskens et al. (2009) Nature 458, 485-488 ...
In the article linked, below, we read that Dr. Wickramasinghe intended to fly to Sri Lanka to gather further information about the Polannaruwa meteorite, over the weekend of Jan. 19-20. He explains a bit about why he believes the object is a meteorite, albeit an unusual one, and where he believes it may have originated. Included in the article is an interesting quote from Sir Arthur C. Clarke. He seems to have seriously entertained the possibility that Hoyle and Wickramasinghes panspermia hypothesis is correct. I recall another of Sir Arthurs famous quotes, to the effect that-- when an elderly scientists says something is impossible, he is usually wrong, and when he says some is or could be so, he is probably right. Ironically, this could now apply to Clarke himself, and to Wickramasinghe. http://www.lankaweb.com/news/items/2013/01/17/chandra-wickramasinghe-coming-to-sri-lankato-gather-further-information/ ...
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First time submitter Mastiff in Norway writes Famous (in Norway) Norwegian astrophycisist Knut Jørgen Røed Ødegaard is ecstatic after a meteorite was found in an urban cottage in Oslo this weekend. This is the 14th meteorite thats been found in Norway, and only the second that crash...