Uranus and Neptune remain two of the most mysterious objects in the solar system, primarily because theyve only been visited by NASAs Voyager 2 spacecraft in 1986 and 1989, respectively. Their ice giant moniker comes from longstanding hypotheses that their interiors are comprised of an icy mantle beneath their hydrogen/helium atmospheres. While Jupiter and Saturn are also comprised primarily of hydrogen and helium, Uranus and Neptune are hypothesized to have a layered structure comprised of icy elements within their interiors.
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