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Are you asking why there isn't more mass in the planetary system? The reasons go back to the collapse and fragmentation of the protostellar cloud and the subsequent accretion (from a pseudo-spherical envelope) of the bulk of the protostellar material. It has little to do with subsequent processes occurring in the accretion disc. If the disc had too much ...


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I feel that HDE gives a good start of an answer, but stops short of the important part. We have seen in HDE's answer the formation of a star at the center of the collapsing molecular cloud. When the star begins to fuse lighter elements, the protoplanetary disk has several forces acting on it: The momentum of the particles in the disk. The gravity of the ...


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It's because of the Sun. It might be good if I give a quick overview on star formation before I get to the meat of the issue. Here's star formation in a few simple steps: Giant Molecular Cloud forms. A large region of gas and dust, essentially a dense version of the interstellar medium, coalesces into an interstellar cloud. GMCs can be tens or hundreds of ...


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IAU failed to understand that the concept "planet" is a cultural concept, not a scientific concept, not any more anyway. Of course there's no distinct objective scientific definition between what is a planet and what is not. Mercury and Jupiter in the same category? Yeah, right, as if that clarifies what we are talking about when we use the word "planet"! ...



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