Sentences with word «chondrite»

My research has focused on characterizing the soluble and insoluble organic materials of carbonaceous chondrite meteorites with the aim to trace their abiotic origins in Solar and / or pre-Solar extraterrestrial environments.

Using a new analytical technique, the team looked at different kinds of chondrite meteorites, a type of primitive meteorite approximately 4.6 billion years old.

He suggests that the body that triggered the Moon - forming impact, which some scientists call Theia, may have been chemically similar to a class of meteorites called enstatite chondrites.

This suggests that the value of K / U ≈ 1 X 104 is characteristic of terrestrial materials and is distinct from the value of 8 X 104 found in chondrites.

They estimate the impacting meteoroid would have been about half the size of a pinhead (0.8 millimeter), assuming a velocity of about 4.3 miles (7 kilometers) per second and a density of an ordinary chondrite meteorite (2.7 grams / cm3).

As CM chondrite is one of the oldest types of rock in the universe, Cooke says that dating the newly discovered fragments will be a priority.

There is one other LL chondrite whose orbit is known: the asteroid Itokawa, which the Japanese Hayabusa spacecraft visited in 2005.

The characterization of Annama indicates that this is an ordinary H5 chondrite, a group of meteorites with high strength that constitutes 31 % of meteorite falls.

Yoshihiro Furukawa at Tohoku University in Sendai, Japan, and colleagues used a high - velocity propellant gun to simulate the impacts of ordinary carbon - containing chondrite meteorites — the most common type of meteorite — into the early ocean.

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.

Two possible ways that the inner solar system received water are: water molecules sticking to dust grains inside the «snow line» (as shown in the inset) and carbonaceous chondrite material flung into the inner solar system by the effect of gravity from protoJupiter.

A recent analysis of chondrites by Carnegie's Myriam Telus was concerned with iron - 60, a short - lived radioactive isotope that decays into nickel - 60.

Here, meteoriticist Laurence Garvie holds a large piece of a famous carbonaceous chondrite known as Murray, which fell in Kentucky in 1950.

I have not tried yet... but you could / can make a sword from stony iron chondrites / meteorites... native iron.

The pesky meteorites / chondrites = life... not the nasty bible.

This is a reflected light image of a metal - sulphide clast in the enstatite chondrite ALH 77295.

Enstatite chondrites are similarly reduced and may be a good proxy to the chemical building blocks.

Almost on a whim, Piatek paid $ 6000 for the stone — cheap in the meteorite world — thinking it was nothing more than a regular chondrite.

To investigate, a team led by Conel Alexander from the Carnegie Institution of Washington in Washington DC measured the amount of deuterium, a heavy isotope of hydrogen, in 86 chondrite samples found on Earth.

Or, the proto - moon and proto - Earth were showered by the same family of carbonaceous chondrites soon after they separated, said James Van Orman, professor of earth, environmental and planetary sciences at Case Western Reserve, and a co-author.

«The measurements themselves were very difficult,» Hauri said, «but the new data provide the best evidence yet that the carbon - bearing chondrites were a common source for the volatiles in the Earth and moon, and perhaps the entire inner solar system.»

«The carbonaceous chondrites don't really work.»

Based on data obtained with the Gamma Ray and Neutron Detector aboard the Dawn spacecraft, Prettyman et al. (p. 242, published online 20 September) show that Vesta's reputed volatile - poor regolith contains substantial amounts of hydrogen delivered by carbonaceous chondrite impactors.

Physicist John Remo holds a slice of the Leoville chondrite, a meteorite billions of years old.

This period was apparently associated with increased meteoric impacts (around 100 times more frequent than today) associated with the break - up in the Main Asteroid Belt of the L - chondrite parent body — the largest documented asteroid breakup event over the past few billion years.

Fred Ciesla, an associate professor of planetary science at the University of Chicago, says the findings may reclassify chondrites, a class of meteorites that are thought to be examples of the original material from which planets formed.

The Chelyabinsk meteorite is a low iron, low metals chondrite (stony meteorite).

Edwin Thompson holds a large slice of enstatite chondrite meteorite that fell in Alberta, Canada, in 1952.

The meteorite turns out to be a very rare type of rock called CM chondrite, which makes up less than 1 per cent of the meteorites that fall to Earth.

One thing was odd about Chelyabinsk compared to other LL chondrites: it was shot through with cracks that had filled in with molten metal.

The 1,100 - pound (500 kilogram) meteorite is an ordinary H5 chondrite, a type of stony meteorite responsible for 31 percent of Earth's impacts.

This will permit the average terrestrial concentrations of uranium and thorium to be 2 to 4.7 times higher than that observed in chondrites.

This abundance is lower than model estimates of ultraviolet (UV) degradation of accreted interplanetary dust particles (IDP's) or carbonaceous chondrite material.

The water found on the moon, like that on Earth, came from small meteorites called carbonaceous chondrites in the first 100 million years or so after the solar system formed, researchers from Brown and Case Western Reserve universities and Carnegie Institution of Washington have found.

Carbonaceous chondrite meteorites contain vital clues to the evolution of carbon compounds in our solar system preceding the origin of life.

The fact that these isotopes still existed when chondrites formed is shown by the abundances of their stable decay products — also called daughter isotopes — found in some primitive chondrites.

An interesting component of chondrites» makeup is something called short - lived radioactive isotopes.

One type, called carbonaceous chondrites, includes some of the most - primitive known samples.

Instead, he found that, in one meteorite type, called carbonaceous chondrites, the isotope levels were starkly different from other types.

Measuring the amount of these daughter isotopes can tell scientists when, and possibly how, the chondrites formed.

But carbonaceous chondrites are known to have formed later than other meteorites — so it was possible that their peculiar isotopic chemistry reflected changes over time in the disk, rather than a distinct place of origin.

Like a chemical fingerprint, the isotopic ratio between Earth's samples and the carbonaceous chondrites» samples matched.

Some of that water was contained as ice in primitive meteorites called carbonaceous chondrites.

So the researchers took the same chemistry as found in enstatite chondrites, and began to subject them to the sort of pressures and temperatures found in the deep mantle of Mercury.

The cores of the worlds studied by Bouquet and his co-authors are thought to have chondrite - like compositions.

«We took a powdered chemical mix similar in composition to enstatite chondrites, which is thought to represent Mercury's building blocks, and subjected it to high pressures and temperatures.

Radioactive isotopes of elements such as uranium, potassium, and thorium are found in a class of rocky meteorites known as chondrites.