B Gas planets with solid satellites

Jordi H
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I assume that planets and their satellites are created more or less at the same time. Why gaseous planets like Saturn have solid rings and satellites?
 
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Small bodies have too little gravity to hold on to volatiles. Once you have a large enough solid nucleus, and far enough from the star, it can start to accumulate the gasses.
 
Thank you. I did not know that the gaseous planets have solid nucleus.
 
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