Other
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd..11e..16b&link_type=abstract
Pre-Solar Grains as Astrophysical Tools, 26th meeting of the IAU, Joint Discussion 11, 21 August 2006, Prague, Czech Republic, J
Other
Scientific paper
Astrophysical theories cannot explain origin of refractory particles in interstellar media larger than sub-micron dust-grains; so proto-planetary nebula must be mixture of volatiles and dust particles only. Coagulation of such initial particles cannot produce hardened alloys of refractory matter, as meteoroids are. Chemical separation of refractory elements and their melting can take place in nuclei of huge bodies of Earth-size planets only; otherwise temperature inside low-dimension planetesimals will never reach values of melting of iron or silicates. A new cosmogony proposed by author bases on idea that formation of planets takes place on pre-solar stage of evolution of proto-stellar/proto-planetary nebula. In this case internal cores of forming planets are rapidly heated by radioactivity of short-living isotopes; and planet become mostly melted. If such planet is collided by large planetesimal lost by another star (with kinetic energy about 4·10^32 J), it can be totally destroyed into number of moldings. Fragments of internal parts of the planet would remain on orbits close to the former planet one, when other moldings may be ejected to the periphery of solar system. Going through proto-planetary disk, ejected swallows will heap snowflakes of volatiles and produce planetesimals of the second generation. They became population of the Kuiper Belt. When they are dragged into comet orbits they lost their volatiles due to solar radiation, and produce meteoroid streams. Meteoroids are refractory long-living particles, the largest of them having stabile orbits and being not dragged by Poynting-Robertson effect. To prove this hypothesis a special TV observations of meteors are done since 2002. The hypothesis predicts that all particles in one stream are of the same mineral composition and of the same density.
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