How the US Detonated a 1.4-Megaton Nuclear Bomb 400km Above Earth

The United States once conducted a high-altitude nuclear test known as Starfish Prime. The test involved the detonation of a 1.4-megaton thermonuclear bomb approximately 400 kilometres above the Earth's surface. The experiment was carried out as part of Cold War-era nuclear testing programs. The detonation took place in the upper reaches of the atmosphere, far above populated areas.
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