Quote:
Originally Posted by jungle11
Is that measured by the distance over which we can resolve visible light?
Also, with my relative viewpoint from earlier, wouldn't such a process of decay occur instantaneously to the photon?
How can any change occur to the wavelength of the photon instantaneously?
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Sorry mate I was only joking :-)
Photon is stable and does not decay. We can detect it even if it is coming from near the edge of the visible Universe.
What is happening, thought, wavelength is changed (it becomes longer) because of expansion of the universe (similar to Doppler effect), so the photons from the edge of the visible Universe would have wavelengths infinitely long (frequency would have been zero, energy also zero).