planetary spacecraft Voyager 2 was the first human spacecraft to visit Neptune. It completes an orbit of the sun once every 165 years. That had never before been seen for this planet or for any other planet of its class, so JWST is really delivering on its promise. It has eight known moons, of which Triton is the largest, and a ring system containing three bright and two dim rings. Neptune - Minus 330☏ (-200☌) Dwarf Planet Pluto - Minus 375☏ (-225☌) This graphic shows the mean temperatures of various destinations in our solar system. The blue gas giant, which has a diameter four times that of Earth, was named for the Roman god of the sea. Methane gas in its upper atmosphere makes it look blue. Noting its movement relative to background stars over 24 hours confirmed that it was a planet. Neptune is the second coldest planet in the Solar System after Uranus, and the furthest from the Sun. On September 23, 1846, Le Verrier informed Galle of his findings, and the same night Galle and his assistant Heinrich Louis d’Arrest identified Neptune at their observatory in Berlin. Neptune is the outermost planet in the solar system, earning that distinction when the International Astronomical Union reclassified Pluto as a dwarf planet. Neptune, generally the eighth planet from the sun, was postulated by the French astronomer Urbain-Jean-Joseph Le Verrier, who calculated the approximate location of the planet by studying gravity-induced disturbances in the motions of Uranus. Voyager 2 also made the definitive observations of the planet’s rings and saw storms. German astronomer Johann Gottfried Galle discovers the planet Neptune at the Berlin Observatory. Its instruments measured an atmospheric temperature of -220 degrees Celsius (-360 degrees Fahrenheit), with wind speeds as high as 2,100 kilometers per hour, possibly driven from heat radiating deep within the planet.
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