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: The [[colour]] of an [[object]] affects the rate at which it [[Absorb (Physics)|absorbs]] or [[emit]]s [[infra-red]] [[radiation]]. Dark [[colour]]s both [[Absorb (Physics)|absorbs]] and [[emit]] [[infra-red]] [[radiation]] more quickly than [[light]] [[colour]]s.
: [[Reflectivity|Reflective]] surfaces [[emit]] the least '''black body radiation'''.
: When the rate of [[emission]] and [[Absorb (Physics)|absorption]] are the same then an [[object]] will remain at a constant [[temperature]]. If the rate of [[emission]] is greater than the rate of [[Absorb (Physics)|absorption]] then the [[object]] will decrease in [[temperature]]. If the rate of [[emission]] is less than the rate of [[Absorb (Physics)|absorption]] then the [[object]] will increase in [[temperature]].