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What are planets made of?
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The planets that are closest to the Sun, from Mercury to Mars, are small, rocky worlds. They have a metal centre, or core, surrounded by a thick mantle of rock with a thin, rocky crust on the surface. The outer planets are very different. Jupiter and Saturn are made mostly of hydrogen. Uranus and Neptune have a rocky core surrounded by ice and hydrogen. Pluto is made of rock, with an icy coating.
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Previous:
Back
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Book:
Best Ever Q&A
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Section:
Space
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Chapter:
The Planets
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