01
Neptune is the outermost major planet and an ice giant with a hydrogen-helium-methane atmosphere, strong internal heat flow, high-speed winds, dark storm systems, narrow rings, and an unusually tilted magnetic field.
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02
Neptune emits significantly more energy than it receives from the Sun, providing internal heat that helps drive vigorous convection and weather.
supported03
Voyager 2 measured Neptune's atmosphere, rings, magnetic field, and moons during its 1989 flyby.