* Astronomy

France exploded its first hydrogen bomb in 1968.

Canopus (also Opération Canopus in French) was the code name for France's first two-stage thermonuclear test, conducted on August 24, 1968 at Fangataufa atoll. The test made France the fifth country to test a thermonuclear device after the United States, the Soviet Union, the United Kingdom and China.
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French Nuclear Test - Canopus