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3 definitions found
 for Nebular hypothesis
From The Collaborative International Dictionary of English v.0.48 :

  Hypothesis \Hy*poth"e*sis\, n.; pl. Hypotheses. [NL., fr. Gr.
     ? foundation, supposition, fr. ? to place under, ? under + ?
     to put. See Hypo-, Thesis.]
     1. A supposition; a proposition or principle which is
        supposed or taken for granted, in order to draw a
        conclusion or inference for proof of the point in
        question; something not proved, but assumed for the
        purpose of argument, or to account for a fact or an
        occurrence; as, the hypothesis that head winds detain an
        overdue steamer.
        [1913 Webster]
  
              An hypothesis being a mere supposition, there are no
              other limits to hypotheses than those of the human
              imagination.                          --J. S. Mill.
        [1913 Webster]
  
     2. (Natural Science) A tentative theory or supposition
        provisionally adopted to explain certain facts, and to
        guide in the investigation of others; hence, frequently
        called a working hypothesis.
  
     Syn: Supposition; assumption. See Theory.
          [1913 Webster]
  
     Nebular hypothesis. See under Nebular. Hypothetic

From The Collaborative International Dictionary of English v.0.48 :

  Nebular \Neb"u*lar\, a.
     Of or pertaining to nebulae; of the nature of, or resembling,
     a nebula.
     [1913 Webster]
  
     Nebular hypothesis, an hypothesis to explain the process of
        formation of the stars and planets, presented in various
        forms by Kant, Herschel, Laplace, and others. As formed by
        Laplace, it supposed the matter of the solar system to
        have existed originally in the form of a vast, diffused,
        revolving nebula, which, gradually cooling and
        contracting, threw off, in obedience to mechanical and
        physical laws, succesive rings of matter, from which
        subsequently, by the same laws, were produced the several
        planets, satellites, and other bodies of the system. The
        phrase may indicate any hypothesis according to which the
        stars or the bodies of the solar system have been evolved
        from a widely diffused nebulous form of matter.
        [1913 Webster]

From WordNet (r) 3.0 (2006) :

  nebular hypothesis
      n 1: (cosmology) the theory that the solar system evolved from a
           hot gaseous nebula

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