Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.250c.523d&link_type=abstract
In ESA, Proceedings of the 20th ESLAB Symposium on the Exploration of Halley's Comet. Volume 3: Posters p 523-524 (SEE N87-26714
Astronomy and Astrophysics
Astronomy
5
Aggregates, Astronomical Models, Comet Nuclei, Fractals, Stellar Mass Accretion, Deposition, Evolution (Development), Interplanetary Dust
Scientific paper
It is generally accepted that solid bodies in the solar system are formed by accretion of grains. Recent investigations concluded the relative velocities were less than a few hundred cm s-1 and a size distribution of aggregates formed and continued accumulating. The accreting clusters would be low density aggregates. Numerical simulations of the structure of these aggregates show they are fractals with low density and irregular shapes. Comet nuclei forming from a mixture of ice and dust grains are likely to have non-uniform composition as well as structure. Such a nucleus appears to account for observed characteristic of comets. The structure has significant implications for the evolution of cometary nuclei.
Donn Bertram
Hughes David
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