sentence: Voyager 2 produced images showing the Great Dark Spot, a storm on Neptune, as it approached the planet in 1989. By the time the Hubble Space Telescope photographed Neptune in 1994, the spot had disappeared.
modified: fix grammar: voyager 2 produced images showed the great dark spot, a storm on neptune, as it approached the planet in 1989. by the time the hubble space telescope photographed neptune in 1994, the spot have disappear.