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Why isn't the sky violet?
If violet has the shortest wavelength, then by the high school reasoning behind why the sky is blue, shouldn't it be violet? Why are stars blue shifted and not violet shifted?
1 Answer
- Anonymous1 decade agoFavorite Answer
Those questions are completely unrelated. The sky is blue because that is just the wavelength that it doesn't absorb. Stars are "violet shifted" except that we just call it blue shift because usually we don't have a fast enough relative velocity to shift it that much. Blue shift is caused by moving toward a light source at high speed which decreases the wavelength of the light you see. Red shift is the opposite, caused by moving away.