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Origins Of the Solar System - Coggle Diagram
Origins Of the Solar System
Models Of the Solar System
Helliocentric Model
Sun is the center of the solar system
Discovered by NIcolaus Copernicus
Earth's orbital motion around the sun causes the seeming reverse in direction of the motions of the planets
Gelliocentric Model
Earth is the center of the Solar System
Discovered by Claudius Ptolemy
The model was an accepted explanation of the different motions in the universe
Theories of Solar System
NEBULAR HYPOTHESIS
stars form in massive and dense clouds of molecular hydrogen—giant molecular clouds
clouds are gravitationally unstable and matter , which then rotate, collapse, and form stars. Star formation is a complex process, which always produces a gaseous protoplanetary disk
Result of a star formation
10 - 100 years to form
Planetisimal And Tidal Theories
Planetisimal Theory
Developed by T. C. Chamberlin and F. R. Moulton
Encounter or collision theories, in which a star passes close by or actually collides with the sun, try to explain the distribution of angular momentum
Developed in the early part of 2oth century
Tidal theory
Proposed by James Jeans and Harold Jeffreys in 1918
A huge tidal wave, raised on the sun by a passing star, was drawn into a long filament and became detached from the principal mass
PROTOPLANET THEORY
Proposed by von Weizsacker and modified by Gerald P. Kuiper.
It is believed that nine protoplanets were formed, and these were originally much larger than the finished planet
Astronomers support this theory