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

===== For density to rise while space is expanding: =====
* Either new matter/energy keeps getting created everywhere,
* Or space shrinks (collapses), but you said “during the Big Bang,” which we usually think of as expansion.

Creating matter out of nowhere:
* Breaks energy conservation (unless some exotic mechanism balances it).
* This is kind of like the old steady-state theory idea, where the universe keeps expanding but new matter is magically created so density stays constant.

In your version, it’s even more extreme: density increases over time, so even more matter has to appear.