Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989plr.....9b...4s&link_type=abstract
Planetary Report (ISSN 0736-3680), vol. 9, Mar.-Apr. 1989, p. 4-9.
Astronomy and Astrophysics
Astronomy
Comets, Cosmology, Planetary Evolution, Solar System, Stellar Evolution, Accretion Disks, Comet Nuclei, Comet Tails, Infrared Astronomy, Interstellar Space, Comets, Solar System, Origin, Formation, Clouds, Accretion Disk, Rotation, Gravity Effects, Hypotheses, Condensation, History, Planets, Nebula, Sun, Atmosphere, Orbits, Satellite Observations, Vega System, Beta Pictoris System, Satellites, Evolution, Interplanetary Dust, Grains, Ice, Thermal Effects, Chemistry, Gases, Gravity Effects, Collisions, Orbits
Scientific paper
Consideration is given to the Kant-Laplace hypothesis that the sun once had a ring system from which the planets condensed. It is suggested that the theory is supported by the IRAS observation of an accretion disk around Vega, which implies that ordinary stars are surrounded by a disk during and immediately after formation. A model for planetary formation from a disk is presented. The possibility that cometary bodies may have been ejected into the Oort Cloud during planetary formation is examined.
Druyan Ann
Sagan Carl
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