When stars are moving away from us the color of their light is shifted toward the ______ (red or blue) end of the light spectrum because the wavelegth is ________ (shorter or longer).
a. red; longer
b. red; shorter
c. blue; longer
d. blue; shorter
a. red; longer (When stars are moving away from us the color of their light is shifted toward the red end of the light spectrum because the wavelength is longer.)
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