Doppler Shift Equation and Redshift - GCSE Physics - YouTube
Redshift
Doppler Effect and red shift for beginners: from fizzics.org - YouTube
Red shift and blue shift in astronomy. Diagram of the Doppler effect, the change in the wavelength of radiation due to the motion of a source (galaxy Stock Photo - Alamy
Voyages | Redshift
Redshift and Distance in the Expanding Universe | ScienceBlogs