The observation that the spectral lines of light from distant galaxies are systematically shifted toward the red end of the spectrum (cosmological redshift) is the primary empirical evidence supporting the expansion of the universe (Hubble’s Law). If the universe were static, uniform, and infinitely old, which established astronomical paradox would the observed universal redshift and the associated dynamic model primarily help resolve?
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What fundamental observation serves as the key evidence that distant galaxies are moving away from Earth and that the universe is expanding, a core tenet summarized by Hubble’s Law?
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