The lifespan of a photon in vacuum is regarded as being infinite though it would have to be predicated on two other factors
Namely that its journey is only ever through empty space and that the Universe itself is either temporally or spatially infinite
Namely that its journey is only ever through empty space and that the Universe itself is either temporally or spatially infinite
A MIND IS LIKE A PARACHUTE : IT DOES NOT WORK UNLESS IT IS OPEN