What is the "Electromagnetic Spectrum" and reference at least one Scientist's contribution to the field.

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The electromagnetic spectrum are all the wavelengths of radiation from short waves (gamma rays) to long waves(radio waves) and all the wavelengths in between, that are produced by the sun and other stars.  James Clerk Maxwell, an English scientist, found out 150 years ago that when electrical fields and magnetic fields are coupled together, they will form electromagnetic waves, capable of moving forever, unless absorbed by matter. Heinrich Hertz from Germany using Maxwell's ideas, proved the existence of radio waves in the 1880's. A frequency used in radio waves called the hertz is one cycle, per second and was named for him.

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