TIL Gravity is not about mass pulling other mass. It's mass bending time spacetime that makes other mass get closer

Matter bends spacetime. Spacetime tells matter how to move.

Using this logic, you can imagine that above a certain threshold, this can become a feedback loop. These locations are black holes, where enough matter located in a small enough volume of spacetime can create enough distortion to further force more matter into the same volume of spacetime.