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From Interstellar Dust to Comet Dust and Interplanetary Particles

Published online by Cambridge University Press:  14 August 2015

J. Mayo Greenberg
J. Mayo Greenberg*
Affiliation:
Laboratory Astrophysics, University of Leiden, Niels Bohrweg 2, 2333 CA Leiden, The Netherlands

Abstract

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Interstellar dust is described as consisting predominantly (by mass) of tenth micron (mean size) silicate core-organic refractory mantle particles which have evolved over galactic time scales of the order of 5 billion years. These particles were incorporated into comets and asteroids in the presolar nebula 4.5 billion years ago. The fragmentation of those primitive bodies gives rise to solar system debris which shows up as comet dust, zodiacal light, IDP’s and meteorites. The chemical and morphological structure of comet dust is derived here as fluffy aggregates of interstellar dust. The chemical and morphological structure of the chondritic porous IDP’S are then derived from comet dust which has evolved in the solar system. Zodiacal light particles are interpreted as various stages between comet dust and IDP’s. Meteorites appear to be a side branch in the evolution from interstellar to solar system particles.

Type
Joint Discussions
Information
Highlights of Astronomy , Volume 8: Highlights of Astronomy. As presented at the XXth General Assembly of the IAU, 1988 , 1989 , pp. 241 - 250
Copyright
Copyright © Kluwer 1989

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