LEO orbital shell capacity has a hard ceiling of approximately 240,000 satellites across all usable shells due to collision geometry constraints

MIT Technology Review's technical assessment identifies a fundamental physical constraint on LEO constellation scale: approximately 4,000-5,000 satellites can safely operate in a single orbital shell before collision risk becomes unmanageable. Across all usable LEO shells, this creates a maximum capacity of roughly 240,000 satellites total. This is a geometry problem, not a technology or economics problem—you cannot fit more objects in these orbital volumes without catastrophic collision risk regardless of how cheap launches become or how sophisticated tracking systems are. SpaceX's 1 million satellite filing exceeds this physical ceiling by 4x, requiring approximately 200 orbital shells operating simultaneously (the entire usable LEO volume). Blue Origin's 51,600 satellite Project Sunrise represents approximately 22% of total LEO capacity for a single operator. This constraint is independent of and more binding than launch cadence, debris mitigation technology, or orbital coordination systems—it's pure spatial geometry.