Dust reddens starlight because:
A) it re-emits the light it absorbs at red wavelengths
B) it emits mostly in the infrared due to its cold temperature
C) it is made mostly of hydrogen, which produces the red H-alpha emission line
D) it preferentially affects light at visible and shorter wavelengths
E) it primarily moves away from Earth

Question

Quizplus · Accepted Answer

Dust particles scatter and absorb shorter wavelengths of light (such as blue and ultraviolet) more efficiently than longer wavelengths (such as red). This results in the reddening of starlight as it passes through a cloud of dust.

Dust Reddens Starlight Because