This is a drawing that shows the history of the inside of a giant planet.
Click on image for full size
Image from: The New Solar System
How the Interior of Uranus Formed
The drawing shows the possible history of the inside of giant planets.
As the planets drew material from the solar cloud, bits of heavy rock came to where the planet was forming, as shown in figure A.
Once the planet finished forming, these heavy bits of rock fell into the middle of the planet, as illustrated in figure B.
As shown in the picture, the gas part of the planet is much bigger than the rocky part. That is because the amount of gas and ice which came to Uranus in the beginning depended upon where Uranus was in the original solar cloud.
Eventually, the heavy, rocky material at the center became a core, as illustrated in figure C.
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