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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 Neptune 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 Neptune was in the original solar cloud.

Eventually, the heavy, rocky material at the center became a core, as shown in figure C.


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Windows to the Universe, a project of the National Earth Science Teachers Association, is sponsored in part is sponsored in part through grants from federal agencies (NASA and NOAA), and partnerships with affiliated organizations, including the American Geophysical Union, the Howard Hughes Medical Institute, the Earth System Information Partnership, the American Meteorological Society, the National Center for Science Education, and TERC. The American Geophysical Union and the American Geosciences Institute are Windows to the Universe Founding Partners. NESTA welcomes new Institutional Affiliates in support of our ongoing programs, as well as collaborations on new projects. Contact NESTA for more information. NASA ESIP NCSE HHMI AGU AGI AMS NOAA