Timeline of other background radiation fields

   * 1912 - Victor Hess discovers that the ionization of air increases with
     altitude indicating the existence of cosmic radiation
   * 1949 - Herbert Friedman detects evidence for extrasolar X-rays
   * 1962 - Riccardo Giacconi, Herbert Gursky, F. Paolini, and Bruno Rossi
     formally discover the X-ray background

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