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1800 – William Herschel, a British astronomer, discovered infra-red radiation (heat waves).
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1801 - German chemist Johann Ritter discovered UV radiation.
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1885 – James Maxwell, a British scientist, predicted the existence of continuous EM waves.
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1887 – German scientist Heinrich Hertz discovered radio waves.
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1895 – German physicist Wihelm Roentgen discovered x-rays.
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1896 – French physicist Henri Becquerel discovered radioactive rays emitted by uranium.
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1898 – Marie Curie discovered radium.
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1900 – Frenchman Paul Villard discovered gamma rays.
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