Where is the past? Everything we apprehend is of the immediately past moment, to be sure; the inputs to our mind now are the outputs of what happened then, are as it were the outward, objective “surface” of the past. So we could answer with a wave of the hand, “It’s right there!” We can notice where things are in relation to each other within that past moment. But where is that moment located? Where likewise is the unrealized future, or for that matter, where is this present moment? Where is its space?
What is the space within which the spatial configuration of the universe evolves, in which one moment is related to another? It would seem that we need that space. How otherwise could events be related to each other causally, whether timewise or spacewise?
It’s no good to postulate that there is a hyperspace, like Plato’s Receptacle or Newton’s Sensorium, or Hilbert Space, or Aristotle’s Prime Matter. That just kicks the can down the road. Where is Hilbert Space?
What are we really asking when we ask where something is located? Are we not asking about what characterizes its environment, so that we can find it? “The can opener is in the top drawer to the left of the sink.” We never have to ask this question about the past, because it is always immediately present to our apprehension, so that we never have to look for it.
So we could say that the location of the present moment is in the context of the immediately past moment, which environs it by constraining the possibilities really potential to it. This brings to mind an image of an onion ever growing new inmost layers, each environed by the layer immediately outside it. But again, this just pushes the question out a … well, a layer: where is the onion?
Where is the history of all the worlds? It must be somewhere, or it just wouldn’t be anywhere, and we would not exist. Where is it, then?
The question answers itself. Indeed, there is only one possible answer.