What is the evidence of strengths for red shift?

The evidence for redshift primarily comes from the observation of distant galaxies and the cosmic microwave background radiation. Edwin Hubble's observations in the 1920s showed that light from distant galaxies is shifted toward longer wavelengths (redshift), indicating that they are moving away from us. This supports the expanding universe model, suggesting that the universe is expanding over time. Additionally, the redshift is consistent across various wavelengths and objects, reinforcing the theory of an expanding universe as predicted by the Big Bang theory.