Low Earth orbit is the most congested and contested environment humans operate in. Every satellite launched adds to the population; every collision creates hundreds of fragments. Without active stewardship, the orbits we depend on could become unusable within decades.
Low Earth orbit is the most congested and contested environment humans operate in. Every satellite launched adds to the population; every collision creates hundreds of fragments. Without active stewardship, the orbits we depend on could become unusable within decades.
Only about a third of catalogued objects are working satellites. The rest is spent hardware and debris — and the untracked population below 10 cm is orders of magnitude larger. Every piece travels at 7+ km/s.
Space sustainability isn't just an astronaut problem — it affects services billions of people rely on every day.
The launch rate is accelerating faster than at any point in the space age — driven primarily by commercial megaconstellations.
Space is so big there's plenty of room
Useful orbits concentrate in narrow altitude bands. LEO at 400–600 km is already congested.
Debris burns up quickly so the problem is self-solving
Only below ~500 km. At 800 km, debris lingers for decades. At 1,000 km, centuries.
The next lesson explores the nightmare scenario that drives all sustainability policy: Kessler Syndrome.