Neptune

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Neptune : the planet eighth in order from the sun — Merriam-Webster See also OneLook

Encyclopedia

Neptune Neptune is the eighth and farthest-known planet from the Sun. It is the fourth-largest planet by diameter, the third-most-massive planet, and the densest giant planet. It is 17 times the mass of Earth, and slightly more massive than its near-twin Uranus. Neptune is denser and physically smaller than Uranus because its greater mass causes more gravitational compression of its atmosphere. It is referred to as one of the solar system’s two ice giant planets (the other one being Uranus). Being composed primarily of gases and liquids, it has no well-defined “solid surface”. The planet orbits the Sun once every 164.8 years at an average distance of 30.1 AU (4.5 billion km; 2.8 billion mi). It is named after the Roman god of the sea and has the astronomical symbol ♆, representing Neptune’s trident. — Wikipedia

Neptune (Encyclopædia Britannica)
Neptune (COSMOS: The SAO Encyclopedia of Astronomy)

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Inspiration

Articles about Neptune (Big Think)

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Innovation

Science

Voyager Program is an American scientific program that employs two robotic interstellar probes, Voyager 1 and Voyager 2. They were launched in 1977 to take advantage of a favorable alignment of Jupiter and Saturn, to fly near them while collecting data for transmission back to Earth. After launch the decision was taken to send Voyager 2 near Uranus and Neptune. — Wikipedia

Solar System Exploration: Neptune (NASA Science)
Neptune, Planet of Wind and Ice (Planetary Society)

Neptune (Eric Weisstein’s World of Astronomy, Wolfram Research)
Neptune (Wolfram Alpha)

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Preservation

History

Neptune is not visible to the unaided eye and is the only planet in the Solar System found by mathematical prediction rather than by empirical observation. Unexpected changes in the orbit of Uranus led Alexis Bouvard to hypothesise that its orbit was subject to gravitational perturbation by an unknown planet. After Bouvard’s death, the position of Neptune was predicted from his observations, independently, by John Couch Adams and Urbain Le Verrier. Neptune was subsequently observed with a telescope on 23 September 1846 by Johann Galle within a degree of the position predicted by Le Verrier. Its largest moon, Triton, was discovered shortly thereafter. — Wikipedia

Astronomers Discover Neptune, the Eighth Planet (John Uri, NASA Johnson Space Center)
Neptune’s Discovery (Encyclopædia Britannica)
Discovery of Neptune (Wikipedia)