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PIX4622802: Neptune seen by Voyager 2 - Image of Neptune obtained by the Voyager 2 probe on August 20, 1989. Neptune has an equatorial diameter of about 49,000 kilometres. Its blue color is due to the abundance of methane in its atmosphere. In this photo, in the centre, the Great Dark Spot, which is the size of the Earth where winds are blowing at 300 m/s. This spot has now disappeared but other dark spots have been detected since then. Under the Great Dark Spot, on the left, a small cloud of irregular shape moving very quickly, nicknamed the scooter / Bridgeman Images