What is the Hubble flow?
A) Distant superclusters of galaxies are all moving toward us on one side and away from us on the other, as part of a universal flow of galaxies throughout the universe.
B) Distant superclusters of galaxies are all moving away from us at approximately the same speed.
C) Distant superclusters of galaxies are all moving away from us, their speed increasing with increasing distance.
D) Distant superclusters of galaxies are all moving away from us, their speed decreasing with increasing distance.
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