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Definition of Nebular theory

Nebular theory Definition from Religion & Spirituality Dictionaries & Glossaries
Rakefet
Nebular Theory A theory of the origin of the solar system of Laplace, Herschel, and others, much in favor during the earlier part of the 19th century, but since fallen into disfavor. The hypothesis was devised to explain certain facts, especially that the planets all revolve in the same direction, that their satellites (except those of Uranus and Neptune) revolve around their primaries in this same direction, and that the planets so far as we know rotate in this same direction. The theory assumes the sun to have started as a very diffused, tenuous gas or nebula, extending much farther than its present volume. The combined influence of gravitation and of contraction by cooling resulted, in accordance with dynamic laws, in the separation of parts of the mass into rings, and these rings afterwards coalesced severally into planets; and their motions of revolution and rotation are thus according to this theory explained.
Better knowledge of the dynamic principles concerned has discredited the theory in its details; it conflicts particularly with the principle of the conservation of the moment of inertia and with the kinetic theory of gases. Moreover, the solar system is now seen to be more complex than had been supposed, the planetoids for instance having very eccentric motions.
In The Secret Doctrine Blavatsky credits the theory's authors with a great intuitional perception of certain cosmogonical facts, and to a certain extent approves the theory in its broad outline but not in its details.
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Nebular theory Definition from Encyclopedia Dictionaries & Glossaries
Wikipedia English - The Free Encyclopedia
In cosmogony, the nebular hypothesis is the most widely accepted model explaining the formation and evolution of the Solar System. There is evidence that it was first proposed in 1734 by Emanuel Swedenborg. Originally applied only to our own Solar System, this method of planetary system formation is now thought to be at work throughout the universe. The widely accepted modern variant of the nebular hypothesis is Solar Nebular Disk Model (SNDM) or simply Solar Nebular Model.

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