On this day in 1945, early in the morning, the flash of the first-ever nuclear explosion illuminated the skies over the New Mexico desert.
The light of a nuclear explosion is unlike anything else on Earth. This is because the heat of a nuclear explosion is unlike anything else on Earth. Seventy years ago today, when the first atomic weapon was tested, they called its light cosmic.
The operation was designated as top secret, which was a problem, since the whole point was to create an explosion that could be heard for a hundred miles around and seen for two hundred. How to keep such a spectacle under wraps? Oppenheimer and his colleagues considered several sites, including a patch of desert around two hundred miles east of Los Angeles, an island eighty miles southwest of Santa Monica, and a series of sand bars ten miles off the Texas coast.
The scientists were prepared to cancel the test and wait for better weather when, at five in the morning, conditions began to improve. At five-ten, they announced that the test was going forward. At five-twenty-five, a rocket near the tower was shot into the sky—the five-minute warning. Another went up at five-twenty-nine. Forty-five seconds before zero hour, a switch was thrown in the control bunker, starting an automated timer.
, the fireball rises out of the frame before the cameraman, dazed by the sight, pans upward to follow it. The written accounts of the test, of which there are many, grapple with how to describe an experience for which no terminology had yet been invented. Some eventually settle on what would become the standard lexicon. Luis Alvarez, a physicist and future participant in the Hiroshima bombing, viewed Trinity from the air.
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