Other
Scientific paper
Jan 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978icar...33...50h&link_type=abstract
Icarus, vol. 33, Jan. 1978, p. 50-61.
Other
40
Astronomical Models, Planetary Evolution, Collision Parameters, Collisions, Cosmic Dust, Interstellar Matter, Planetary Mantles, Planetary Mass, Solar System, Particle Interactions, Accretion, Grain Size, Impact Velocities, Regolith, Planetesimals, Solar System, Origin, Evolution, Collisions
Scientific paper
Experiments in vacuum (approx. 0.5 to 1 mbar) and in air quantify mechanics of collisions, rebound, and fragmentation at low velocities (1-50 m/sec), under the conditions usually postulated for the preplanetary environment in the primitive solar nebula. Such collisions have been little studied experimentally. Contrary to widespread assumptions, accretionary growth of the largest meteoroid- and asteroid-sized bodies in a given swarm results spontaneously from the simple mechanics of these collisions, without other ad hoc sticking mechanisms. The smaller bodies in the swarm are less likely to grow. Granular surfaces form, either by gravitational collapse of dust swarms or by rapid formation of regolith surfaces on solid planetesimals; these surfaces strongly promote further growth by retarding rebound. Growth of large bodies increases modal collision velocities, causing fragmentation of smaller bodies and eventual production of interstellar dust as a by-product of planetesimal interactions.
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