Yet more interesting questions about Israel’s relationship with apartheid South Africa and the testing of nuclear weapons, a love both countries shared:
On 22 September 1979 at about 1 a.m. GMT, a US Vela satellite passing over the South Atlantic detected a double flash of light in the vicinity of Prince Edward Island. The satellite had been launched in 1969 in order to detect atmospheric nuclear tests. When a nuclear weapon explodes in the atmosphere, the heat of the fireball strips the electrons off the atoms and molecules of the surrounding air. For a fraction of a second the ionised air is opaque, until the blast blows it away. The resulting double flash is the signature of a nuclear explosion.