the colour shift of the "stars" is linked to the observed shift in the colour spectrum of stars as they move about the universe, relative to the observer.
The stars display a doppler effect when they move, Red Shift- stars are moving away, Blue - stars are moving closer.
http://en.wikipedia.org/wiki/Doppler_effect
http://en.wikipedia.org/wiki/Hubble%27s_law
http://en.wikipedia.org/wiki/Red_shift
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