Comet formation in molecular clouds

Details Comet formation in molecular clouds Comet formation in molecular clouds

Jun 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985icar...62..384c&link_type=abstract

Icarus (ISSN 0019-1035), vol. 62, June 1985, p. 384-388.

Computer Science

8

Comets, Interstellar Matter, Molecular Clouds, Solar System, Density (Number/Volume), Isotopes, Mass, Metallicity, Comets, Formation, Clouds, Long-Period Comets, Perturbations, Orbits, Celestial Mechanics, Capture, Escape, Solar System, Density, Metal, Abundance, Isotopes, Particles, Chronology, Origin, Hypotheses

Scientific paper

The observed properties of the long-period comet system, and its periodic disturbance by galactic forces manifesting as terrestrial impact episodes, may be indicative of a comet capture/escape cycle as the Solar System orbits the Galaxy. A mean number density of comets in molecular clouds of ≡10-1±1AU-3 is implied. This is sufficient to deplete metals from the gaseous component of the interstellar medium, as observed, but leads to the problem of how stars are formed nevertheless with solar metal abundances. Formation of comets prior to stars in dense systems of near-zero energy may be indicated, and isotope signatures in cometary particles may be diagnostic of conditions in young spiral arm material.

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