This following example explains my question. Let's take a spread out bed sheet, which represents spacetime. At the center of the bed sheet, I start to crumple/wrap the fabric of the bed sheet. The crumpled fabric at the center of the bed sheet represents a planet (or any material object/particle). This idea comes from thinking that matter is mostly, or perhaps as empty as space, and therefore matter could be thought of as crumpled or folded space (spacetime); therefore, in theory, if matter is un-crumpled it will unfold into just space (spacetime). So, in this idea, spacetime = matter. Spacetime or matter are like water. Water can be gaseous or solid. I am sure physicists must have thought about this before, so my question is what have they said about it, and why have they concluded that this is not the case?
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