Neptune is named after the Roman god of the sea. An atmosphere of thick hydrogen, helium, and methane the methane and other gases gives the planet a blue-green appearance.

It has clouds blowing rapidly in bans, Neptune has the fastest supersonic winds in the solar system reaching over 2000 km/hr.

The upper-level clouds temperature is – 218° C

The dark spot in the atmosphere is thought to be a hole in the atmosphere layer much like the hole in Earth’s Ozone layer.

Exploration

• 1989: Voyager 2 has been the only spacecraft to visit Neptune

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