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INTRO:
In August of 1989, Voyager 2 was the first and only ship so far to fly by Neptune. This was the only time we really
were able to observe the interesting atmosphere of Neptune.
COMPOSITION AND COLOR:
It's atmosphere consists of 85% hydrogen, 13% helium, and 2% methane. The icy particles of methane are the cause
of Neptune's blue appearance because it absorbs wavelengths of red light and transmits the reflected blues.
CLOUDS AND STORMS:
It was also recorded to have the greatest wind speeds compared to any other planet in our solar system, reaching
speeds of 2000 km/hour. This causes Neptune's features like clouds to form and dissipate over several hours.
Neptune's largest storm, The Great Dark Spot is an Earth-sized hurricane spinning counter-clockwise in the thick
methane atmosphere of Neptune. The shape, size, and location of this spot vary greatly over time: It disappears
and re-appears occasionally.
TEMP:
Infrared measurements made by Voyager 2 indicated a higher temperature of at least minus 218 deg C
(minus 360 deg F). Thus Neptune, like Jupiter and Saturn but unlike Uranus, appears to have an internal energy source.
Written by Dane Atkinson