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How does red shift provide evidence of an expanding universe?(5 points)

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  1. Doppler Effect: Redshift occurs due to the Doppler effect, where light from moving objects changes frequency. Objects moving away from us show longer (redder) wavelengths.

  2. Observed Redshift: Astronomers observe that most distant galaxies exhibit redshift, indicating they are moving away from Earth.

  3. Hubble's Law: Edwin Hubble discovered a correlation between a galaxy's distance and its redshift—more distant galaxies have higher redshifts, supporting expansion.

  4. Expanding Universe Model: The redshift data suggests that space itself is expanding, causing galaxies to recede from each other over time.

  5. Big Bang Theory: The concept of redshift aligns with the Big Bang theory, indicating that the universe has been expanding since its inception.