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The correct answers are:
- Expansion of the universe: The shift of the hydrogen absorption spectrum towards longer wavelengths (redshift) indicates that the universe is expanding.
- The Big Bang theory: The redshift of the hydrogen absorption spectrum is consistent with the predictions of the Big Bang theory, which describes the initial expansion and evolution of the universe.
- Motion of the galaxy: The shift of the hydrogen absorption spectrum can also provide information about the motion of the galaxy itself.