L
lroux
Guest
As the Universe expands the wavelength of light from distant galaxies grows from 122 nanometers, to 900 nanometers, then 500 nanometers, etc. Does this mean that some day in the future the wavelength of that distant light will be so large that we could physically hear the distant Universe? Can the wavelength of a photon be stretched so much that it falls into the range of human hearing? Or would that require that the photon have mass?