6.3 Can Comets be the Only Source Op Interplanetary Dust?
نویسندگان
چکیده
منابع مشابه
Comparison of comet 81P/Wild 2 dust with interplanetary dust from comets.
The Stardust mission returned the first sample of a known outer solar system body, comet 81P/Wild 2, to Earth. The sample was expected to resemble chondritic porous interplanetary dust particles because many, and possibly all, such particles are derived from comets. Here, we report that the most abundant and most recognizable silicate materials in chondritic porous interplanetary dust particles...
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If small comets are as numerous in the inner solar system as Prank et al. [1986a] have recently proposed, large and easily detectable amounts of hydrogen would be generated in interplanetary space. Inhibition of water vapor production by a factor of 3 x 10 -9 by very thick dust mantles would be necessary to prevent excitation of a detectable interplanetary Lyman a glow. Other optical problems a...
متن کاملOxygen isotopic composition of chondritic interplanetary dust particles: A genetic link between carbonaceous chondrites and comets
Oxygen isotopes were measured in four chondritic hydrated interplanetary dust particles (IDPs) and five chondritic anhydrous IDPs including two GEMS-rich particles (Glass embedded with metal and sulfides) by a combination of high precision and high lateral resolution ion microprobe techniques. All IDPs have isotopic compositions tightly clustered around that of solar system planetary materials....
متن کاملOnly Fermions Can Be Elementary
In standard Poincare and anti de Sitter SO(2,3) invariant theories, the existence of antiparticles is explained by using the fact that covariant equations have solutions with negative energies. In these theories a particle and its antiparticle are described by independent positive energy irreducible representations (IRs) of the symmetry group. Such an approach cannot be applied in de Sitter SO(...
متن کاملMigration of interplanetary dust.
We numerically investigate the migration of dust particles with initial orbits close to those of the numbered asteroids, observed trans-Neptunian objects, and comet Encke. The fraction of silicate asteroidal particles that collided with the Earth during their lifetime varied from 11% for 100 micron particles to 0.008% for 1 micron particles. Almost all asteroidal particles with diameter d >/= 4...
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ژورنال
عنوان ژورنال: International Astronomical Union Colloquium
سال: 1976
ISSN: 0252-9211
DOI: 10.1017/s0252921100052258