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ror of calling any mere hypothesis a theory.
Nebular Hypothesis. –The Nebular Hy-
pothesis, which was first, as it were, tenta-
tively put forward by Laplace as a note in
˜
his SystAme du Monde , supposes the so-
lar system to have been a flat, disk-shaped
nebula at a high temperature in rapid ro-
tation. In cooling it condensed, leaving re-
volving rings at different distances from the
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