Facts that must be accounted for in any theory of solar system formation All the major planets orbit in almost the same plane All the planets orbit in the same direction Almost all the planets rotate in the same direction as they orbit The inner planets are rocky bodies while the outer planets are gaseous and/or icy bodies 99% of the mass of the solar system is in the Sun Most of the angular momentum of the solar system is in the planets, not the Sun Look at ClassAction Solar System Properties Explorer in the Solar System Characteristics module
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