Aerial view of the first atomic bomb blast's dark crater surrounded by a lighter splash created when the explosion's heat literally melted the sand to glass. Within a month of this test in New Mexico, the United States dropped atomic bombs on Hiroshima and Nagasaki, ending the Second World War and ushering in an anxious, unpredictable new era: The Atomic Age.
Photo: Fritz Goro./Time & Life Pictures/Getty Images