Neptune
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Neptune is the eighth and farthest known planet orbiting the Sun. It is the fourth-largest planet in the Solar System by diameter, the third-most-massive planet, and the densest giant planet. It is 17
Galileo Galilei may have been the first person to sight Neptune
Urbain Le Verrier mostly successfully predicted Neptune's position
Johann Gottfried Galle was requested by Le Verrier to look for Neptune
John Couch Adams independently calculated Neptune's position
Great Dark Spot
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The Great Dark Spot was one of a series of dark spots on Neptune similar in appearance to Jupiter's Great Red Spot. In 1989, GDS-89 was the first Great Dark Spot on Neptune to be observed by NASA's Vo
Neptune
…atmosphere has active and consistently visible weather patterns. At the time of the Voyager 2 flyby in 1989, the planet's southern hemisphere had a Great Dark Spot comparable to the Great Red Spot on Jupiter. In 2018, a newer main dark spot and smaller dark spot were identified and studied. These weather patterns…
The Great Dark Spot in approximate natural color as seen from Voyager 2
Dark spot on Neptune full color (left) and blue light (right) in a 2016 photo.
The Great Dark Spot (top), Scooter (middle white cloud), and Dark Spot 2 (bottom), with contrast exaggerated.