question archive The main observation that led Hubble to conclude that the universe is expanding was: A
The main observation that led Hubble to conclude that the universe is expanding was: A
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The main observation that led Hubble to conclude that the universe
is expanding was: A. the distribution of the galaxies in the universe B. the classification of different types of galaxies C. the redshift of light from distant galaxies D. the collision of galaxies E. the rotation rate of the edges of galaxies F. the ratio of hydrogen to helium in a galaxy
