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The interstellar absorption It is the phenomenon by which a star appears less luminous, due to its distance. This is caused by the presence, in interstellar space, of clouds formed by gases and dusts.
Considering that these substances are uniformly distributed in space, in a path of about 3,000 AL, the luminosity of a star should be reduced by 0.5m. The distribution of interstellar matter, however, is not uniform, and therefore the absorption coefficient varies in each case.
Interstellar absorption also presents the phenomenon of selectivity: it is experienced to a greater extent by blue light and to a lesser extent by red. This is why the stars behind dense interstellar clouds appear redder. This phenomenon is known precisely as interstellar redness and the difference between the value of the measured color and the average value of the color index of the stars of the spectral type examined, is called "excess color."
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