planetesimal hypothesis


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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.

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]
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
References in periodicals archive ?
This planetesimal hypothesis retained a certain popularity for nearly half a century.