Sentences with phrase «in chondrites»

«Clear evidence of [former] 60Fe in chondrites was first found in troilite (FeS) and magnetite (Fe3O4).»

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 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.

Not exact matches

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.

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

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.

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

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

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

The investigators found that the deuterium / hydrogen ratio in the melt inclusions was relatively low and matched the ratio found in carbonaceous chondrites.

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

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.

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.

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

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.

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

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?»

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.

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.

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.

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 sayIn 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 sayin 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.

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.

In gas with extra carbon or too little oxygen, carbon compounds like carbides and graphite condense out instead of silicates, possibly explaining the origin of carbonaceous chondrites and suggesting the possibility of carbon planets.

«Carbon planets could form in much the same way as do certain meteorites in our solar system, the carbonaceous chondrites,» said Dr. Marc J. Kuchner of Princeton University, making the report in Aspen together with Dr. Sara Seager of the Carnegie Institute of Washington.

u «An H3 — 6 chondrite called Zag fell in the Moroccan Sahara desert five months [after the Monahans meteorite] that also had halite crystals with water inclusions.»

«The complex suite of organic materials in carbonaceous chondrite meteorites probably originally formed in the interstellar medium and / or the solar protoplanetary disk, but were subsequently modified in the meteorites» asteroidal parent bodies.

One type, called carbonaceous chondrites, contain some of the most - primitive known samples of Solar System material, including a lot more xenon than is found in our own planet's atmosphere.

The so - called «Galactic Cosmic Rays» probably come directly from the Sun's pulsar core, and were recorded as a gradient in cosmic ray exposures of meteorites at the birth of the solar system: iron meteorites > stone meteorites > carbonaceous chondrites