Uranus, Neptune May Be Magma Worlds, Not Ice Giants

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 ...