An astronomer detects redshift in the light from a distant galaxy. Which statement about redshift is correct?
- AIt is the decrease in the observed wavelength of red light emitted from receding galaxies.
- BIt is evidence that the Universe is contracting and supports the Big Bang Theory.
- CIt is evidence that the Universe is expanding and supports the Big Bang Theory.
- DRedshift is when light from receding galaxies appears blue.