Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983ap%26ss..89...61m&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 89, no. 1, Jan. 1983, p. 61-75.
Astronomy and Astrophysics
Astrophysics
6
Cosmology, Galactic Structure, Milky Way Galaxy, Solar System, Sun, Angular Momentum, Density Wave Model, Galactic Rotation, Spiral Galaxies, Stellar Evolution
Scientific paper
It is noted that the special conditions of the sun's position in the Galaxy explain the origin of the fundamental cosmogony timescales T1 (approximately 4.6 x 10 to the 9th yr), T2 (approximately 10 to the 8th yr), and T3 (approximately 10 to the 6th yr) detected by the radioactive decay of various nuclides. The timescale T1 (the solar system's 'lifetime') is defined as the protosolar cloud lifetime in a space between the galactic spiral arms. The timescale T2 is defined as the presolar cloud lifetime in a spiral arm, and T3 is a timescale of hydrodynamical processes of a cloud-wave interaction. The possibility of a natural explanation of the cosmogony timescales by the unified process (provided that the sun is near the state of corotation) is seen as a possible argument in favor of the fact that the nearness to the corotation is necessary for the formation of systems similar to the solar system. It is pointed out that if the special position of the sun is not incidental, then the corotation circles of our Galaxy, as well as those of other galaxies, are regions where situations similar to ours are likely to be found.
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