Time will pass for them very very closely to the same rate it does for us. But here's something fun: the space between us and them is stretching, so in a billi

Time will pass for them very very closely to the same rate it does for us. But here's something fun: the space between us and them is stretching, so in a billion years when the light arrives at our position, the time between photons will be longer than when they left (so things will appear slower) and the photons will be at a longer wavelength making it more red.