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All the 8 planets initially after the formation of the solar system were in the form of gas. But later on as the time passed the inner planets cooled down and their surface turned hard. But the remaining 4 planets are in their gaseous state till present.

First of all they have got many moons orbiting around them

They have got huge gravitational force

they are bigger than the inner planets

None of their surfaces shall solidify in the future.

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11y ago

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