| The composition of Phoebe should reflect the composition of the region of the solar nebula where it formed. |
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| Thus, meteorites represent a fossil record of the early conditions of the solar nebula. |
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| The inner planets all formed from the disk of gas and dust, the solar nebula, that surrounded our young sun. |
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| Jupiter's core formed rapidly relative to the rate at which gas was lost from the solar nebula. |
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| But those ices could only condense in the solar nebula where it was very cold. |
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| Comets formed in the outer regions of the solar nebula where it was cold enough for volatile ices to condense. |
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| They appear to be primarily aggregates of material that formed in the solar nebula prior to or during planet formation. |
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| Under its own gravitational attraction, the cloud collapsed into a rotating disk of matter, called the solar nebula. |
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| The inclusions in Allende and other carbonaceous chondrites are thought to be the earliest-formed solids in the solar nebula. |
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| If Jupiter formed simply as an accretion aggregate of the solar nebula, then it should not have acquired such tremendous angular momentum. |
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| It is plausible that this methane was trapped initially in the primitive solar nebula in the ices which formed Titan. |
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| Most of the material in the solar nebula, however, was pulled toward the center and formed the sun. |
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| According to this theory, the solar nebula began to collapse because of its own gravity. |
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| As shown in Table 1, the refractory lithophiles and siderophiles constitute about 1 per cent by mass of the total condensable material in the solar nebula. |
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| What is interesting about chondrules is that radiometric dating has put them among the first solids to have formed in the solar nebula. |
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| Fractionations among refractory lithophile elements were related to processes in the solar nebula 4.6 Ga ago. |
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| The majority of chondrites reside within the asteroid beld and bear witness to the early history of the solar nebula. |
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| My research has largely been in the chemistry of how the particular components of chondrites, very primitive meteorites, actually formed in the solar nebula. |
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| Here, however, the accretion of icy planetesimals produced objects with masses 10 times that of Earth, sufficient to cause the gravitational collapse of the surrounding gas and dust in the solar nebula. |
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| They contain the original material from the solar nebula, which can tell us about the conditions of our solar system's birth. |
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| Astronomers believe our solar system was formed from a solar nebula or gas cloud, consisting mostly of hydrogen and helium gases. |
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| The composition of cometary ices provides key information on the chemical and physical properties of the outer solar nebula where comets formed, 4.6 Gy ago. |
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| But the comet actually formed much closer to the center of the solar nebula, the cloud of dust and debris that coalesced into the Sun and planets. |
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| Within the solar nebula, lies an imaginary temperature line called the frost line. |
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| It is a rare component of some meteorites and has scientific importance in solar nebula research. |
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| Cosmologists who hold to a naturalistic origin of our solar system believes that it formed from a giant, rotating cloud of gas and dust known as the solar nebula. |
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| Comets condensed out of the contracting solar nebula at the formation of the solar system, in the distant Edgeworth-Kuiper belt and Oort Cloud. |
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| Our study shows that chondrules formed at higher pressures relative to canonical solar nebula pressures and that some chondrules and CAIs formed penecontemporaneously. |
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| One theory of planetary formation suggests that some gaseous giant protoplanets of Jovian mass formed first from a solar nebula via disk instability. |
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| The samples that Genesis returns will show us the composition of the original solar nebula that formed the planets, asteroids, comets and the sun we know today. |
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| The simultaneous presence of fluid motions and abundant particles in the solar nebula make charge separation a likely but at the present time speculative phenomenon. |
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