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Definitions of Neptune:
  • noun:   a giant planet with a ring of ice particles; the 8th planet from the sun
  • noun:   (Roman mythology) god of the sea; counterpart of Greek Poseidon
  • name:  A surname (very rare: popularity rank in the U.S.: #22774)



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Alternative Terms
celestial-mechanics uranus methane deduce helium magnetosphere retrogradation tenuous carbon-monoxide carbon-dioxide pluto planet voyager-in-astronomy great-red-spot triton prograde-and-retrograde-motion ring-in-astronomy astronomy sun telescope neptune-in-roman-religion-and-mythology-8th-planet-from-the-sun solar-system asteroids neptune-jpg urbain-jean-joseph-leverrier john-couch-adams johann-gottfried-galle orbit epoch-astronomy apsis astronomical-unit semi-major-axis day julian-year-astronomy mean-anomaly inclination longitude-of-the-ascending-node argument-of-periapsis natural-satellite moons-of-neptune equator geographical-pole flattening spheroid volume mass density surface-gravity acceleration g-force-3 escape-velocity sidereal-time obliquity right-ascension declination albedo bond-albedo geometric-albedo temperature river-kelvin apparent-magnitude angular-size scale-height hydrogen ethane ammonia water-annabelle-chvostek-album ammonium-hydrosulfide earth-disambiguation neptune-mythology astronomical-symbols poseidon trident atmosphere voyager-2 space-probe great-dark-spot jupiter september-23 1846 perturbation august-25 1989 nasa neptune-orbiter cassini-huygens-3 jet-propulsion-laboratory california-institute-of-technology discovery-of-neptune galileo-galilei december-28 1612 january-27 1613 fixed-stars conjunction-astronomy-and-astrology night-sky alexis-bouvard george-biddell-airy astronomer-royal