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Viktor Safronov
Viktor Sergeevich Safronov ((ロシア語:Виктор Серге́евич Сафронов)) (born Velikie Luki, Russia, 11 October 1917 - died Moscow 18 September 1999) was 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.
==Biography and legacy==
Safronov graduated from Moscow State University 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).
A minor planet 3615 Safronov, discovered by US-American astronomer Edward L. G. Bowell in 1983 is named after him. Safronov's work is discussed at length in the BBC documentary The Planets (TV miniseries)
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