Based on the observed red shifts in the spectral lines of distant galaxies, astronomers conclude that___________ .

Name: Based on the observed red shifts in the spectral lines of distant galaxies, astronomers conclude that___________ .
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The observed red shifts in the spectral lines of distant galaxies indicate that they are moving away from us, which suggests that the universe is expanding. This is in line with the Big Bang theory of the origin of the universe.

Based on the Observed Red Shifts in the Spectral Lines