Neptune
15 questions tagged Neptune — spanning every one of the seven Ws.
Why does Neptune look blue?
Methane in Neptune's atmosphere absorbs red light and reflects blue. Recent reprocessing of Voyager images shows it is a paler greenish-blue than the famous deep-blue pictures.
Why does Neptune have the fastest winds in the Solar System?
Neptune’s atmosphere is driven by strong internal heat and fast jet streams, despite getting little sunlight. Winds there can exceed 2,000 km/h.
Why does Neptune have dark storms that appear and disappear?
Neptune’s atmosphere is active and changeable, so large storm systems can form, evolve, and fade. These storms are influenced by winds, internal heat, and changing cloud structures.
What is Neptune’s Great Dark Spot?
Neptune’s Great Dark Spot was a large storm system observed by Voyager 2 in 1989.
When was the first spacecraft to fly by Neptune?
Voyager 2 flew past Neptune on 25 August 1989. It was the first and so far only spacecraft to visit Neptune closely.
When was the first spacecraft to visit Neptune?
Voyager 2 became the first spacecraft to fly by Neptune in 1989.
When were the rings of Neptune first discovered?
Neptune’s rings were confirmed in 1984, after early evidence had suggested their presence.
Where is Neptune’s Great Dark Spot located?
The Great Dark Spot was seen in Neptune’s southern hemisphere. It was a large storm system observed by Voyager 2 in 1989.
Whose math predicted the existence and position of Neptune before it was seen?
Urbain Le Verrier used calculations to predict Neptune in 1846. Johann Gottfried Galle then observed the planet on 23 September 1846.
How do scientists explain Neptune’s unusually strong winds?
Heat escaping from Neptune’s interior helps drive powerful storms and winds. Some winds on Neptune can reach more than 2,000 km/h.
Where is the stormy atmosphere of Neptune most famously observed?
Neptune’s most famous storm systems are seen in its atmosphere, especially the Great Dark Spot regions first photographed by Voyager 2. These storms are high-speed weather features in the planet’s clouds.
Whose calculations first predicted the position of an undiscovered planet from Uranus's motion?
That prediction was made by Urbain Le Verrier, and independently by John Couch Adams. Their calculations led to the discovery of Neptune in 1846.
How do Neptune's winds get so fast?
Neptune’s winds are powered by internal heat and atmospheric dynamics, reaching speeds over 2,000 kilometers per hour in the strongest jets.
Why is Neptune bluer than Uranus?
Both planets have methane, but Neptune also has a thinner haze, letting the blue colour appear deeper. Differences in atmospheric composition and scattering change the shade.
Where is Neptune’s Great Dark Spot seen?
Neptune’s Great Dark Spot was seen in the planet’s southern hemisphere. It was a giant storm observed by Voyager 2 in 1989.