Vela incident
1979 detection of a double light flash near the Prince Edward Islands by American satellites / From Wikipedia, the free encyclopedia
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The Vela incident was an unidentified double flash of light detected by an American Vela Hotel satellite on 22 September 1979 near the South African territory of Prince Edward Islands in the Indian Ocean, roughly midway between Africa and Antarctica. Today, most independent researchers believe that the flash was caused by a nuclear explosion[1][2][3]—an undeclared joint nuclear test carried out by South Africa and Israel.[4][5]
The cause of the flash remains officially unknown, and some information about the event remains classified by the U.S. government.[5] While it has been suggested that the signal could have been caused by a meteoroid hitting the satellite, the previous 41 double flashes detected by the Vela satellites were caused by nuclear weapons tests.[6][7][8]