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Thanks, glad I could help. The nothingness of nothing is actually much harder for people to grasp than you would think, I find that people believing in nothing as if it were something is almost a kind of pervasive cognitive error, so I think most people don't really get that, as obvious a thing as it is once pointed out.
Anyway, as you approached heat death, eventually the forces would become such that your body would be ripped apart and destroyed, but lets assume you could keep observing the universe from some cybernetic body that is only the size of a single point in space. In that case, your frame of reference would eventually disconnect from any other celestial bodies or objects, and would either fall into a black hole or just forever be in the void, with all other objects whatsoever forever inaccessible because they are all receding from you faster than lightspeed.
Yes, it is increasing the distances between distances, although it is also moving at an accelerating rate. However, it appears to have no curvature of any kind (the overall geometry of space time is flat.) So for example the space between all galaxies increases, but also to a very very small degree the distance between subatomic forces also increases. At a certain point, this means that molecular bonds can no longer form or be maintained, and thus all matter in the universe returns to an elemental state. Quite a long while after that, even subatomic bonds are predicted to break down due to acceleration, and will eventually break down one way or the other just by the process of nuclear physics, or ultimate subsumption into cosmic black holes. It is all indeed in the heat death chronology article if you want to get a sense for the timescales at which these things happen, or pic related.
>>heat death would happen before molecular bonds break? or before atomic bonds break?Heat death is the absolute end state after all sorts of physical processes have completely come to an end. It is the moment just before the universe reaches a global temperature of absolute zero, which is special because it means after that literally no changes occur whatsoever, the universe is at 100% entropy. Thus, death.
To make a long story short, we can tell that the space between space has changed relative to itself, and by what percentage, by using the fact that looking farther out into space lets us see further back in time to observe how space was then.