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Electromagnetic radiation of all wavelengths and frequencies. The familiar "rainbow" of light spans a very narrow range in the electromagnetic spectrum, from 700 nm (red) to 400 nm (blue). While the wavelengths of red and blue light differ by less than a factor of two, the entire electromagnetic spectrum spans more than a factor of 10^18, (1 followed by 18 zeroes) from radio to gamma-ray wavelengths. Radio wavelengths can be the size of mountains while gamma ray wavelengths are the size of an atomic nucleus.