Spectral lines from Galaxy B are redshifted from their rest wavelengths twice as much as the spectral lines from Galaxy A. According to Hubble's law, what can you say about their approximate relative distances?
A) Galaxy A is twice as far as Galaxy B.
B) Galaxy B is four times as far as Galaxy A.
C) Galaxy A is four times as far as Galaxy B.
D) Galaxy B is twice as far as Galaxy A.
E) Not enough information to say—you need to know Hubble's constant to answer this question.
D
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