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Meaning of nebular hypothesis

neb'ular hypoth'esis

Pronunciation: [key]
— Astron. Astron.
  1. the theory that the solar system evolved from a mass of nebular matter: prominent in the 19th century following its precise formulation by Laplace.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.