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Timeline of other background radiation fields

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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