There is a general consensus among the physicists that space and time do not exist for the light. This is as per the relativity theory. If existence means existing in space and time, then it can even be said that the light does not exist at all! Yes, some people have gone so far as to say just the same thing about the light that the light does not exist for itself, but that it exists for everything else. But my point is not that one. My point is that how space and time become non-existent for the light when we know very well that they cannot be so by any natural means.
Einstein's equation shows that time totally stops for the light. But what is the reason that time will have to stop for the light at all? Similarly Einstein's another equation shows that if the light has to travel from A to B, then the distance between A and B is reduced to zero for it. We can ask the same question here also: what is the reason that this distance will have to be reduced to zero for the light? Will the light fail to travel from A to B if this distance is not reduced to zero for it? As the travel time is also reduced to zero for the light, so we can also ask: will the light fail to travel from A to B if its travel time is not reduced to zero?
So we do not find any apparent reason as to why space and time will have to be non-existent for the light. Thus here we find that there is not only a how-question, but there is also a why-question. Why do space and time become non-existent for the light? What purpose does it serve? Was it absolutely necessary that they would have to be non-existent for it? Or, could it have been otherwise also? If they were not non-existent, then what would have happened? Would it have been possible for the universe to exist in that case also? Would it have been possible for us to exist? We know very well that science does not attempt to answer any why-question, and so, it is quite natural that we will not get any answer to all these questions of ours from them. But that does not mean that these questions cannot be raised, or that they are not meaningful at all, because science does not have any answer for them.