Your answer got me thinking. You say "things will get so incredibly far apart that the space between each object will make it impossible for them to interact". Is there a theory that we are actually in one of those objects? Like, our universe as we know it was smaller and part of something else, that at some point drifted so far away that we just cannot interact with the rest of it. So something similar to multiverse theory just that it's not parallel or anything much different than one drifted away part.