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Origin of the Solar System OSC_Astro_14_00_Planetesml - Coggle Diagram
Origin of the Solar System 
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Theories
Protoplanet Theory
It is believed that nine protoplanets - one for each of the present day planets - were formed and these were originally much larger than the finished planet.
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Nebular Hypothesis
Is the idea that a spinning cloud of dust made of mostly light elements, called a Nebula flattened into a protoplanetary disk, and became a solar system consisting of a star with orbiting planets