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Neptune — 111 Places in Space That You Must Not Miss
Neptune — 111 Places in Space That You Must Not Miss Neptune, the outermost planet of the Solar System, is highlighted in 111 Places in Space That You Must Not Miss as a world of extremes. Discovered in 1846 after mathematicians predicted its gravitational pull on Uranus, Neptune is a frigid giant where temperatures plunge to –218°C and winds howl at 2,200 km/h. Voyager 2 / NASA, JPL-Caltech / image processing Ardenau4, CC0