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August 13 2013

How Cold War nuclear testing once made orbit unsafe for Apollo


Nine seconds after 11 o’clock on the night of July 8, 1962, a 2,200-pound W-49 nuclear weapon detonated 248 miles above a tiny island to the west of Hawaii. The blast, which yielded 1.4 megatons, instantly turned the night sky daylight-bright. As the flash dissipated, electrons from the explosion interacted with the Earth’s magnetic field to create an artificial aurora thousands of miles long. The residual light danced across the sky for seven minutes. The blast’s accompanying electromagnetic pulse knocked out street lamps 800 miles away.

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