Oh, WOW, this thread wasn't locked!
If galaxies are these enacted spacetime bubbles ..do we need dark matter to be a thing anymore?
The stars we see moving so fast at the edges of galaxies is due to its own spacetime bubble is mostly sticking out of the galaxy bubble. That star is moving in space with extreme time dilation.
We should be asking ourselves how much mass = how much spacetime?
I wouldn't want to be the first person to leave the galaxy. You would age and the different scale of the quantum/classical boundary would probably do something awful to your body.
Spacetime that isn't enacted would be like a deflated balloon ..lifeless. I'm asking what size the bubble gets per 0.3 micrometer of mass. Is the galaxy a giant spacetime bubble ..or more like a tent city?
We can compare galaxies with slow edge stars to ones with fast to give us a clue to the size.