Q. If we look at a galaxy that is moving AWAY from us, we find that the wavelengths of light coming from this galaxy are
Solution:
Visible light is a spectrum of colors, which is clear to anyone who has looked at a rainbow. When an object moves away from us, the light is shifted to the red end of the spectrum, as its wavelengths get longer. If an object moves closer, the light moves to the blue end of the spectrum, as its wavelengths get shorter.
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