planetesimal hypothesis


Also found in: Thesaurus.
Related to planetesimal hypothesis: nebular hypothesis, Planetesimal theory

planetesimal hypothesis

n.
The hypothesis that the planets and satellites of the solar system were formed by gravitational aggregation of planetesimals.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

planetesimal hypothesis

(ˌplænɪˈtɛsɪməl)
n
(Astronomy) the discredited theory that the close passage of a star to the sun caused many small bodies (planetesimals) to be drawn from the sun, eventually coalescing to form the planets
[C20: planetesimal, from planet + infinitesimal]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.planetesimal hypothesis - (cosmology) the theory that the solar system was formed by the gravitational accumulation of planetesimals
scientific theory - a theory that explains scientific observations; "scientific theories must be falsifiable"
cosmogeny, cosmogony, cosmology - the branch of astrophysics that studies the origin and evolution and structure of the universe
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
This planetesimal hypothesis retained a certain popularity for nearly half a century.