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The inner planets are small and rocky and the outer planets are mostly large and gaseous because

User Foamroll
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Answer:

The closer a planet is to the Sun, the warmer it would be. Gases move faster the hotter they are and if they are fast enough (escape velocity), they can escape the gravitational field of their planet and spread in the space. Further planets are gaseous because their gases don't have the energy to escape their gravitational pull

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User Stuart Hemming
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Answer:

The closer a planet is to the Sun, the warmer it would be. Gases move faster the hotter they are and if they are fast enough (escape velocity), they can escape the gravitational field of their planet and spread in the space. Further planets are gaseous because their gases don't have the energy to escape their gravitational pull

User Jden
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