Editing Openai/6921ae73-3700-8000-8ab7-90012976bb8a (section)

==== In a universe where density rises with time: ====
* Early universe: - Too empty → fewer stars and galaxies form at first.
* Middle universe (sweet spot): - Enough density for stars, galaxies, planets. - Maybe life can appear for a while.
* Late universe: - Density gets so high that: - Collisions, mergers, and black holes become common. - Radiation levels rise. - Environments become hostile. - Large-scale collapse begins.

So instead of our universe’s story:

: 

you get:

: 

===== If the universe slowly gained its density over time: =====
* You’d need new matter appearing or space shrinking (or both).
* Gravity would get stronger and stronger on cosmic scales.
* The universe would tend toward collapse, not endless expansion.
* Long-term, it’d likely end in a Big Crunch–style high-density death, not a cold, empty fade-out.
* Any life and galaxies would be temporary guests in a universe that’s ultimately on its way to crushing itself.

If you want to crank it up further, we can ask:
* What if density increases so much that every region becomes a black hole?