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        Uranus's Interior | Earth and Space

        Illustration showing the core, mantle and crust of Uranus. The standard model of Uranus's structure is that it consists of three layers: a rocky core in the center, an icy mantle in the middle and an outer gaseous hydrogen/helium envelope. The rocky core of Uranus is relatively small, with a mass of 0.55 Earth masses and a radius less than 20 percent of Uranus's; the mantle is about 13.4 Earth masses, and comprises the bulk of the planet; the upper atmosphere weighs only that of 0.5 Earth masses and extends for the last 20 percent of Uranus's radius.

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