Value chain · CLM-0754
In plain terms
ESA's 2026 report projects that collisions between existing pieces of debris will keep making more debris in low Earth orbit even if nothing else is ever launched, and it makes no such projection for geostationary orbit at all; nothing in the register says whether the same runaway effect would happen up there or not.
The claim as recorded
The same ESA report projects a cascade of collision events over the next centuries from current orbit use, continued fragmentations and limited post-mission disposal success, and states that even with no further launches collisions among the debris already present are expected to lead to further growth in the space debris population in Low Earth Orbit, with its Figure 11 captioned as cumulative collisions in the IADC LEO protected region; the report models this cascade in LEO only and contains no equivalent GEO cascade model, which is an absence in the source and not a finding about physics, and no source in the register supports any statement about whether the same mechanism does or does not operate at GEO.
Scope and limits
The finding is about the source, not about orbital mechanics. It may NOT be reported as evidence that a Kessler-type cascade cannot occur at GEO, nor that it can. It is also not evidence that no GEO cascade model exists anywhere; it is evidence that the two debris-environment sources in the register do not contain one. The LEO projection itself is a simulation over centuries and may not support the words validated, proven or demonstrated. Kessler's 1978 postulate is reported here as ESA's own historical attribution, not as a claim about the 1978 paper's contents, which has not been read.
What it assumes
That the PDF text layer of SRC-226 is complete. Its figure pages are readable: PyMuPDF extracts their labels directly, and pdftotext returns them offset by 29 character codes, which decode to the same text. Searched on 2026-09-25 across all 151 pages with both extractors, they contain no GEO cascade model, and the long-term evolution section (7.2, pp.144-148) mentions LEO and never GEO, geostationary or geosynchronous.
Where it comes from
p.10, verbatim: "Despite the improvement in orbital clearance efforts, the extrapolation of the current changing use of orbits and launch traffic, combined with continued fragmentations and limited post mission disposal success rate could lead to a cascade of collision events over the next centuries. Even in case of no further launches into orbit, it is expected that collisions among the space debris objects already present will lead to a further growth in space debris population in Low Earth Orbit." Figure 11 caption, same page, verbatim: "Number of cumulative collisions in LEOIADC in the simulated scenarios of long-term evolution of the environment." Historical attribution, SRC-226 p.12, verbatim: "The effect whereby the generation of space debris via collisions and explosions in orbit could lead to an exponential increase in the amount of artificial objects in space, in a chain reaction which would render spaceflight too hazardous to conduct, was first postulated by Donald Kessler in 1978". Absence check: a whole-document search of SRC-226 for cascade and graveyard terms returns the LEO passage above and the GEO disposal section at p.135; SRC-229 was checked and contains no GEO population breakdown (CLM-0755).
Basis: cumulative catastrophic collisions, count, over a multi-century simulation horizon; orbit regime of the model
Related records
- Answers question
- QST-011 not published in this release
Cite this
energyaperture.com/c/clm-0754
CLM-0754, Energy Aperture, as of 2026-05-01.
Connected records
Other published records linked to this one. A list, not a judgement.
- Also from SRC-226
- CLM-0750The 2020 edition of the international debris guidelines says a retiring geostationary satellite should climb at least 235 km above its...CLM-0751Working the international disposal formula through by hand shows that for a very large and very light satellite the extra height it must...CLM-0752ESA's 2026 report says that nothing naturally removes objects from geostationary orbit the way the atmosphere slowly clears low orbit, so a...CLM-0753ESA's 2026 report says the world is not clearing satellites out of orbit well enough, that even the usual 90 per cent success target would...CLM-0756The international space debris guidelines are advice, not law: ESA's own report says they are a starting point for national rules and...CLM-1183ESA's 2026 report counts about 960 catalogued objects in geostationary orbit at the end of 2025, about 800 of them satellites, but nearly...CLM-1188Over the past ten years, almost every satellite retiring from the geostationary belt has tried to move itself out of the way as the debris...
- Also from SRC-229
- CLM-0755NASA's July 2026 debris bulletin counts 33,098 tracked objects in orbit as of 4 May 2026, of which 18,189 are satellites and 14,909 are...