• noun the set of differing wavelengths of light that are reflected from objects and sensed by the eyes
  • verb to give colour to something
  • Property of light caused by the mix of different wavelengths it contains. Light of a single wavelength is called monochromatic, one-colour. The colours of the rainbow show the spectrum from which the other visual colours are made by mixing. In addition, astronomers apply the term colour to radiation in non-visible wavelengths and use terms derived from visual observation to describe it. Thus they call radio signals with a wide range of energy ‘white’ since white light contains all the spectrum colours in balanced amounts, and talk about redshifts in invisible frequencies.

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