Photo by Corbis via Getty Images.
If you’ve seen images of the various mushroom clouds captured during U.S. nuclear weapons tests of the 1950s, you’ve probably wondered why so many feature odd-looking horizontal streaks around them. These smoke trails, which can be seen in the topshot above, aren’t present in images taken during the first-ever nuclear weapons test – code-named ‘Trinity’ – in July 1945, or in the iconic images of the atomic bombings of Hiroshima and Nagasaki in August 1945.