Explain the motion of galaxies.
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Which of the following is the correct interpretation of the Hubble's law?
A. As galaxies move outward, they are replaced with new matter created to take its place.
B. The farther away a galaxy is from us, the faster it is moving away, because of the big bang.
C. Galaxies are not moving through space, it is space that is expanding over time.
D. Galaxies are stationary but time continues to change, giving the appearance of motion.
Why are there different types of galaxies?
The spectra of most galaxies show redshifts. What does this show?