In the 1960s, the United States, the United Kingdom, and the Soviet Union signed a treaty banning nuclear weapons tests inside Earth’s atmosphere. Shortly thereafter, the U.S. Air Force launched the Vela satellites, 12 surveillance devices…

In the 1960s, the United States, the United Kingdom, and the Soviet Union signed a treaty banning nuclear weapons tests inside Earth’s atmosphere. Shortly thereafter, the U.S. Air Force launched the Vela satellites, 12 surveillance devices…