Sentences with phrase «of chondrite»

It didn't have the heft of a chondrite, which are typically rich in dense metals.

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.

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.

Microscopic analyses of chondrites, the oldest rocks in the solar system, are filling in details of what our neighborhood in space was like shortly before the planets formed

In total, the effects proved to be small for the melt inclusions, and the ratios remained consistent with the those of the chondrites.

Not exact matches

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.

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

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

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

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.

The vast majority are chondrites, pieces of asteroids filled with little glassy beads called chondrules.

The stone's noble gas content supports an extraterrestrial origin, while the presence of tiny diamonds — larger than nanodiamonds found in a common kind of meteorite called chondrites, but similar in size to diamond aggregates known to be formed by impacts — supports a cometary origin.

McCord's grad students set to work on the data and came up with some preliminary findings: Ceres was a carbonaceous chondrite (a type of asteroid composed of water locked in minerals and carbon - based materials), and it had not been thermally altered.

Though the cometary region is now ruled out, the exact birthplace of the carbonaceous chondrites is far from certain, says Fred Ciesla, a researcher at the University of Chicago.

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.

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

Stony meteorites, or chondrites — such as this fragment of the Axtell meteorite, found in Texas in 1943 — are among the most common larger pieces.

Most knowledge about the first solid bodies in the solar system comes from meteorites called carbonaceous chondrites, thought to be chunks of the first asteroids.

On his desk at ASU are some polished slices of NWA 6991, a speckled, black stone known as a carbonaceous chondrite: the most primitive type of meteorite containing some of the first material from the solar system's youth.

Early accretion of water in the inner solar system from a carbonaceous chondrite - like source.

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

The meteorite's composition matches that of an LL chondrite, — the LL stands for Low iron, Low metals.

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 moreover show that the light signature emitted by Phobos and Deimos is incompatible with that of the primordial matter that formed Mars (meteorites such as ordinary chondrite, enstatite chondrite and / or angrite).

For one, the new data throw a wrench in the conventional story that carbonaceous chondrites — a water - rich variety of asteroid — delivered water to an initially dry Earth after its formation.

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

Deimos is composed of rock rich in carbonaceous material, much like C - type asteroids and carbonaceous chondrite meteorites.

He might ask, «What's the range of iron content in the ordinary chondrites?»

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.

It appears similar to a group of asteroids known as carbonaceous chondrites.

Scientists have speculated that a rain of carbonaceous chondrites may have seeded early Earth with the raw material for biology here.

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.

They found the closest match to be an enstatite chondrite, an extremely rare form of meteorite that is thought to make up only about 2 percent of the meteorites that fall to Earth.

They also determined, based on this rapid cooling rate and the composition of lava deposits on Mercury's surface, that the planet likely has the composition of an enstatite chondrite — a type of meteorite that is extremely rare here on Earth.

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.

That, combined with nitrogen isotope data, points to carbonaceous chondrites as the most likely common source of water.

The measurements show that 4 - Vesta contains the same hydrogen isotopic composition as carbonaceous chondrites, which is also that of Earth.

The most primitive known meteorites, carbonaceous chondrites, were formed in the same swirl of dust, grit, ice and gasses that gave rise to the sun some 4.6 billion years ago, well before the planets were formed.

The study's authors turned to another potential source of Earth's water — carbonaceous chondrites.

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.

Some chondrite classes have up to a few percent of carbon in the dark rock matrix, but not in the chrondules, in which it got lost because of flash - heating events.

«The results confirm one of the basic ideas of planetary formation theory, that most of the Earth formed by collisions of smaller objects like carbonaceous chondrites,» says Scott Kenyon at the Harvard - Smithsonian Center for Astrophysics in Cambridge, Massachusetts.

The Murchison meteorite, a large CM chondrite that made landfall in Australia in 1969, is now one of the most studied rocks in the world.

Due to its rarity, Cooke reckons 30 grams of CM chondrite is worth about $ 6000.

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.

«If this finding is correct, then it would suggest that chondrites are not good analogs for the building blocks of the Earth and other planets.

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 composition of the matter from which the solar system formed is deduced from that of stony meteorites called chondrites and from the composition of the Sun's atmosphere, supplemented by data acquired from spectral observations of hot stars and gaseous nebulas.