With regard to the stars, stars fundtion like black bodies where the temperature determines the peak wavelenght of light emitted. Someones else will have to explain about black bodies, i'm no physics talkin' guy.
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The only colors that I've heard of stars being are white, yellow, blue, red, orange, and brown (rare).
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Actually the so called "Brown dwarf stars" are not really stars. They are just massive planets that fall just short of the mass neccessary to start nuclear reactions.