- Satellites below 500km altitude already have ~5 yr lifetime before re-entry. It is enough to limit mega-constellations to stay below this limit to ensure safe

- Satellites below 500km altitude already have ~5 yr lifetime before re-entry. It is enough to limit mega-constellations to stay below this limit to ensure safety of future operations. Still, the collision probability will increase with the growth of such constellations. Introduction of more automated collision resolution protocol, similar to TCAS in aviation, is at least being discussed. - Biggest accumulation of debris happen around 800 km altitude, primary from ASAT tests and derelict satellites. Something should be done about this, but salvage operations are not feasible due to lack of regulatory regime. Things will slowly get worse until they hit the rock bottom. Only then we will see some kind of action.