Multiple Choice
Which statement about Hubble's original data is CORRECT?
A) Hubble's original data were just from the Local Group of galaxies. But the Hubble expansion applies to galaxy-to-galaxy distances within galaxy clusters, so he was able to see the universal expansion within these data.
B) Hubble's original data were for superclusters of galaxies, so he was able to see the effect of the expansion within these data.
C) The Hubble expansion does not apply to galaxy-to-galaxy distances, but the Doppler effect does. Since Hubble used only data from the Local Group, he was actually measuring only Doppler shifts.
D) The Hubble expansion does not apply to galaxy-to-galaxy distances, but it does apply to cluster-to-cluster distances. Hubble's original data were included galaxies beyond the Local Group, so he was able to see the universal expansion within these data.
Correct Answer:
Verified
Correct Answer:
Verified
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