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color
A subjective quality that depends partly on the vagaries of the human visual system. Because the eye is poor at detecting color at low light levels, most stars in the night sky appear white. Blues, red, and yellows are only evident in the case of some of the brighter stars (and planets), or with the aid of binoculars or a telescope. In any event, a quantitative system is needed for scientific purposes and for this the color index is used.
So-called color charge, or simply color, which is a concept in particle physics, has nothing to do with the color perceived by the human eye.
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