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Which does the shift of the hydrogen absorption spectrum of a galaxy provide evidence for? Select the three correct answers.
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- That the galaxy has a radial velocity relative to us (it is moving away — redshifted).
- That the shift is a Doppler (red) shift of the spectral lines due to that motion.
- That galaxies overall are receding from one another — evidence the universe is expanding (supporting the Big Bang picture).
- That the shift is a Doppler (red) shift of the spectral lines due to that motion.
- That galaxies overall are receding from one another — evidence the universe is expanding (supporting the Big Bang picture).
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