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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.
(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
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|Noun||1.||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"
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