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An oval feature on the planet Neptune, discovered on the images returned by the Voyager 2 spacecraft in 1989. It was a storm system in Neptune's cloud layers, similar to the Great Red Spot on Jupiter, but not so long lived: it had disappeared in 1994 when the next observations of Neptune with sufficient resolution were made by the Hubble Space Telescope. Its longest dimension was about the same as the Earth's diameter (approximately 12,000 kilometres or 7,500 miles), making it about half the size of the Great Red Spot.
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