[Bob Campbell]

Hi RP,

We are on our way up to Bangkok at the moment and will be away from home for another couple of weeks. I'll get back to you later. The so-called doppler shift is a shift in the light spectra emitted from stars toward the red end of the spectrum. It is an electromagnetic phenomenon where the wave length is longer but the characterististic spectral lines of hydrogen etc., are in the same relative position, just shifted toward the red end of the spectrum.

Regards,
Bob