Firmament

'Operation Fishbowl'. The United States completed six high-altitude nuclear tests in 1958, but the high-altitude tests of that year raised a number of questions. (first successful test of the Fishbowl series)

Going Nuclear Over the Pacific. A half-century ago, a U.S. military test lit up the skies and upped the ante with the Soviets. - http://www.smithsonianmag.com/history/going-nuclear-over-the-pacific-24428997/