I had a college biology class once and we had a segment with using a microscope. My god I had my own big bang moment! Looking at a single drop of pond water thru a microscope blew my narrow mind away. In that moment I realized there was not only a universe going outward but there's also one going inward. Size is relevant. If the universe going outward is infinite then couldn't we say going inward is also infinite? Just reflecting on it I want to get a powerful microscope but they're probably too expensive