Things can be infinitely large and infinitely small. Every particle is composed of a smaller particle, and so every smaller object has a larger one to encompass or be composed by it... Considering that, our entire universe, and all of space... Is it just another particle? Is there really no end to our plane? Or is it just another finite particle outclassed by a larger one? There can't just be a begginning and an end... That would make no sense. There has to be an existance for something to be nothing... But, then, where did something come from? Not nothing, but how can something be without a beginning or finish without an end?
Imagine, we, every day, share space with an endless number of bodies and existences, and the same goes for any particle, regardless of being larger or smaller... The lives we could have lived are, quite literally, all around us, but yet will never be observed by any but that life that could be. But... I must accept that to entertain this thought would be to extend into infinity, as well, because it's just another part of existence, and existence has no beginning or end.