Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Viktor Sergeevich Safronov (Russian: ) (born Velikie Luki, Russia, October 11, 1917 - died Moscow September 18, 1999) is a Soviet astronomer who put forward the low-mass-nebula model of planet formation, a consistent picture of how the planets formed from a disk of gas and dust around the Sun.Safronov graduated from MSU Department of Mechanics and Mathematics in 1941. He defended a dissertation for the Doctor of Physical and Mathematical Sciences in 1968. His scientific interests were planetary cosmogony, astrophysics and geophysics.His planetesimal hypothesis of planet formation is still widely accepted among astronomers, although alternative theories exist (such as the gravitational fragmentation of the protoplanetary disk directly into planets).
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