I have a qualitative question to ask: The Schwarzschild radius of matter is proportional to its mass. The actual radius of the matter, assuming it is spherical, is proportional to the cube root of its mass. This implies that the density required to form a Schwarzschild radius decreases as total mass increases. Is it therefore conceivable that a massive star cluster could exist very near its own Schwarzschild radius, even though the stars themselves were still spaced at astronomical distances? If this collection of stars were to be perturbed and sent into its own Schwarzschild radius (perhaps through gravitationally attracting a nearby gas cloud that pushes it over the limit), what would be a plausible mode of evolution for the system?