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On July 9, 1962 the United States detonated a nuclear weapon high above the Pacific Ocean. Designated Starfish Prime, it was part of a dangerous series of high-altitude nuclear bomb tests at the height of the Cold War. Its immediate effects were felt for thousands of kilometers, but it would also have a far-reaching aftermath that still touches us today.

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On July 9, 1962 the United States detonated a nuclear weapon high above the Pacific Ocean. Designated Starfish Prime, it was part of a dangerous series of high-altitude nuclear bomb tests at the height of the Cold War. Its immediate effects were felt for thousands of kilometers, but it would also have a far-reaching aftermath that still touches us today.

Nuclear test, [johnston island as seen from] hawaii 1962 :: UPDATE: some info i've found: Starfish Prime was a high-altitude nuclear test conducted by the United States of America on July 9, 1962, a joint effort of the Atomic Energy Commission (AEC) and the Defense Atomic Support Agency (which became the Defense Nuclear Agency in 1971). http://en.wikipedia.org/wiki/Starfish_Prime no nukes dammit!

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Electromagnetic pulse concept.- In July 1962, a 1.44 megaton (6.0 PJ) United States nuclear test in space, 400 kilometres (250 mi) above the mid-Pacific Ocean, called the "Starfish Prime" test, demonstrated to nuclear scientists that the magnitude and effects of electromagnetic pulse (EMP), produced by high altitude nuclear explosion were much larger than had been previously calculated. "Starfish Prime" also made those effects known to the public by causing electrical damage in Hawaii…

1962 Starfish Prime nuclear exploson in space launched from Johnson Island in the Pacific ocean.