In 1989, Voyager 2 made our first close encounter with the stunning blue planet Neptune. Its surprisingly turbulent, storm-laden atmosphere, this far from the sun, was clearly being driven by heat from deep within the planet
Neptune from First Voyager 2 Flyby by NASA. Neptune's hot rocky core is approximately the size of the earth and is made up of nickel, iron and other silicates. Beyond the core, is the large mantle comprising methane, ammonia, water and other compounds. This mantle region is extremely hot, with temperatures ranging from 3000K to 5000K, thus this region corresponds to a superheated liquid region.
Dark, cold & whipped by supersonic winds, Neptune is a hydrogen & helium gas giant in our solar system. Over 30 times as far from the sun as Earth, it takes almost 165 Earth years to orbit our sun. On Neptune, one "day" (time it takes to rotate once on its axis) takes 16 hours. It has 13 moons & 6 rings.