Bethany and Joquin are discussing theories about the universe. Bethany believes that since the beginning of the universe, galaxies have been moving, and will continue to move, toward Earth. Joquin argues that galaxies have been moving away from Earth. Which evidence should Joquin use to support his argument?

Redshift is the stretching of light toward longer, redder wavelengths. Light from distant galaxies is generally redshifted, which indicates that those galaxies are moving away from us. Therefore, Joquin should use redshift; the cosmic microwave background and nucleosynthesis provide other evidence about the universe but do not directly show galaxies moving away.

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