Orbital debris

Assembled from 34 blocks · 3 evidence · 30 related

1. Story
2. The population of non-functional objects in Earth orbit: spent upper stages, dead satellites, deliberately destroyed spacecraft, released hardware, and fragments from collisions, explosions and surface degradation. Space surveillance networks catalogue tens of thousands of objects large enough to track — broadly, above about ten centimetres in low Earth orbit — while statistical models put the number above one centimetre in the high hundreds of thousands to over a million, and the number above one millimetre in the hundreds of millions. The size distribution is what makes it dangerous: at closing speeds around ten kilometres per second an untrackable centimetre-scale fragment carries the kinetic energy of a small car at motorway speed, so the objects most likely to destroy a satellite are precisely the ones that cannot be avoided because they cannot be seen. Two deliberate anti-satellite tests and one accidental collision account for a large share of the catalogued fragments in low Earth orbit. The economic character of the problem is that it is a classic externality: the cost of a fragment falls on every future operator of that altitude band, not on whoever created it. Not a terrestrial place.
3. Knowledge
4. Low Earth orbit broadband constellations
5. Orbital debris
6. Connections
7. Low Earth orbit broadband constellations
8. Low Earth orbit broadband constellations
9. The Kessler collision cascade
10. The FCC five-year post-mission disposal rule
11. Kessler and Cour-Palais publish the collision cascade argument
12. A Chinese anti-satellite test destroys the Fengyun-1C weather satellite
13. The UN adopts voluntary space debris mitigation guidelines
14. Iridium 33 and Cosmos 2251 collide
15. The first sixty Starlink satellites are deployed
16. A Russian anti-satellite test destroys Cosmos 1408
17. The FCC adopts a five-year post-mission disposal rule
18. Orbital debris
19. ITU spectrum and orbital-slot regulation
20. Orbital shells as distinct economic regimes
21. Reusable orbital launch
22. Satellite communications
23. Orbital debris
24. The FCC five-year post-mission disposal rule
25. The first sixty Starlink satellites are deployed
26. OneWeb files for bankruptcy protection
27. The FCC adopts a five-year post-mission disposal rule
28. OneWeb completes its first-generation constellation
29. Amazon begins deploying production broadband satellites
30. A constellation deployment milestone falls due
31. Evidence
32. Supports the catalogued and modelled debris population magnitudes, the altitude dependence of orbital decay, and the fragment contributions of the 2007 Fengyun-1C test, the 2009 Iridium–Cosmos collision and the 2021 Cosmos 1408 test. V55 verification basis: esa.int was refused by the network egress proxy in this session and no search was available, so counts are given as ranges and no edition-specific number is quoted.
33. Sets out the collision-cascade mechanism by which a debris population becomes self-sustaining above a threshold density. V55 verification basis: the paper was not retrieved in this session; the issue and page range are deliberately omitted rather than stated from memory, and only the volume and year are given.
34. Establishes voluntary, non-binding debris mitigation expectations including removal of low-Earth-orbit spacecraft within twenty-five years of mission end. V55 verification basis: the guidelines were not retrieved in this session; the adoption year and the twenty-five-year expectation are stated from author knowledge.