Which Statement About Hubble's Original Data Is CORRECT

question 174

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.

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Definitions:

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