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An American Vela satellite detected an unidentified flash of light near the Prince Edward Islands in the Indian Ocean, thought to be a nuclear weapons test.

Historical image related to An American Vela satellite detected an unidentified flash of light near the Prince Edward Islands in the Indian Ocean, thought to be a nuclear weapons test. from September 22, 1979

Vela (satellite)

Group of satellites to detect nuclear detonations

Vela was the name of a group of reconnaissance satellites developed as the Vela Hotel element of Project Vela by the United States to detect nuclear detonations and monitor Soviet Union compliance with the 1963 Partial Test Ban Treaty.
Source: Wikipedia (CC BY-SA)

Vela incident

1979 detection of a double light flash near the Prince Edward Islands by American satellites

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…
Source: Wikipedia (CC BY-SA)

Prince Edward Islands

Two small subantarctic islands belonging to South Africa

The Prince Edward Islands are two small uninhabited subantarctic volcanic islands in the southern Indian Ocean that are administered by South Africa. They are named Marion Island and Prince Edward Island.
Source: Wikipedia (CC BY-SA)

Nuclear weapons testing

Controlled detonation of nuclear weapons for scientific or political purposes

Nuclear weapons tests are experiments carried out to determine the performance of nuclear weapons and the effects of their explosion. Over 2,000 nuclear weapons tests have been carried out since 1945. Nuclear testing is a sensitive political issue. Governments have often…
Source: Wikipedia (CC BY-SA)