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visible light

In astronomy, the word light is often used to denote any kind of electromagnetic radiation, from infrared radiation to X-rays and beyond. If, in contrast, an astronomer is talking about the ordinary light to which our eyes are susceptible - electromagnetic radiation with wavelengths between about 400 and 700 nanometers (400 to 700 billionths of a meter) - he or she will use the expression "visible light".