Suppose that new measurements prove that our data on the spectral shifts of the

Question

Suppose that new measurements prove that our data on the spectral shifts of the galaxies are correct, but that all the distances of all the galaxies are actually double of what we think they are today. How would the doubling of the distances affect Hubble’s law?
A. It would show that the Universe is expanding twice as fast.
B. It would show that the expansion of the Universe is slowing down.
C. Hubble’s law would still hold; the constant H would be twice its present value.
D. Hubble’s law would still hold; the constant H would be one-half of its present value.
E. None of the choices are correct

Explanation / Answer

Choice D. If spectral shifts are correct, the speeds are correct since the doppler shift depends on speed. v = HD So if v is unchanged, we would need to half H if D doubled. Choice D reflects this equality.

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