[Black-Plaid]

> The density needed to form a black hole decreases linearly with radius, sho why is the universe not one?

I feel like this explains it pretty well.

https://medium.com/starts-with-a-bang/ask-ethan-50-why-didnt...

tl;dr: Schwarzschild’s solution is a static one, meaning that the metric of space does not evolve as time progresses.