Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984cemec..34..289t&link_type=abstract
(Bundesministerium für Wissenschaft und Forschung of Austria, Alexander von Humboldt Colloquium on Celestial Mechanics: The Stab
Astronomy and Astrophysics
Astronomy
2
Gravitational Collapse, Jeans Theory, Nebulae, Planetary Evolution, Planetary Systems, Solar System, Stellar Evolution, Angular Momentum, Infrared Astronomy, Interstellar Gas, Magnetohydrodynamic Turbulence, Magnetohydrodynamic Waves, Molecular Clouds, Protostars, Radio Astronomy
Scientific paper
The basic ideas concerning solar system formation were developed by Kant (1755) and Laplace (1796) whose starting point was the so-called nebular hypothesis. The great advantage of the nebular hypothesis is that many regularities, e.g. prograde motions of all planets and asteroids in almost coplanar orbits, can be explained. Observations in the radio and infrared region strongly support the nebular hypothesis provided that the angular momentum problem can be solved in some way. Three possibilities are listed: (1) magnetic fields via Alfvén waves which can transport angular momentum from the contracting cloud fragment into the external medium, (2) turbulent friction, (3) gravitational torques exerted by high amplitude spiral or bar-like density waves in the nebula.
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