The Grenade Belt
Low Earth orbit now holds more than a million and a half fragments big enough to wreck a satellite. Most of them can't be tracked, and the satellites that can dodge are doing so more often each year.
Estimated objects between 1 and 10 cm in Earth orbit. At orbital speed, ESA says a 1 cm aluminium sphere hits with roughly the energy of an exploding hand grenade. Only about 47,000 objects are tracked. (ESA, 2026)
The smaller the piece, the more of them there are
Radar and telescopes catalogue roughly 47,000 objects. ESA's models estimate the rest, and each step down in size multiplies the count.
catalogued
10 cm (est.)
(est.)
(est.)
Log scale, count of objects. Untracked counts are ESA MASTER model estimates, not observations. Source: ESA Space Debris Office, DISCOS statistics, data to 31 Jul 2026.
Of every satellite ever launched, two-thirds are still up there
About 27,490 satellites have reached orbit since 1957. Some 18,840 remain, and 15,900 still work. Everything else in the catalogue is wreckage.
Total mass in orbit: more than 17,000 tonnes. More than 660 break-ups, explosions and collisions recorded. Source: ESA DISCOS, 31 Jul 2026.
Starlink's dodges went up almost sixfold in two and a half years
SpaceX reports collision-avoidance maneuvers to the FCC every six months. Its latest count works out to one every two minutes or so.
SpaceX moves a satellite when collision odds exceed about 3 in 10 million, far stricter than the common industry trigger of 1 in 10,000, so counts partly reflect that policy and a fleet now over 9,000 satellites. Source: SpaceX semiannual Starlink reports to the FCC (2023–2025), via Space.com.
Three single moments made thousands of fragments each
Two weapons tests and one accident account for a large share of the catalogued debris in low orbit. One bad year can add more.
Catalogued fragments per event. Sources: NASA Orbital Debris Program Office (Fengyun-1C, Iridium–Cosmos, NTRS 2015); US Space Command (Kosmos 1408, initial tracked count, 2021); ESA Space Environment Report 2025 (2024 total).
What a crowded orbit costs
The risk isn't only a single crash. It's a slow chain reaction, where each collision makes the debris for the next one.
Size of an aluminium sphere that, at orbital speed, hits with about a hand grenade's energy. (ESA)
Times the International Space Station has moved to dodge debris, 1999–2022. (NASA, 2022)
Intact satellites or rocket bodies now re-entering the atmosphere, on average. (ESA, 2025)
Total mass of human-made objects in Earth orbit. (ESA DISCOS, 2026)
What you can do
Orbit is a shared resource that underpins weather forecasts, GPS and the internet. Nobody owns it, so it only stays usable if the rules hold.
Back the 5-year rule
ESA and the US FCC now push for dead satellites to leave orbit within five years, down from 25. Support agencies that enforce it.
Oppose debris-making weapons tests
Dozens of countries, led by the US in 2022, have pledged not to run destructive anti-satellite missile tests. Ask your government where it stands.
Ask who cleans up
When you pick a satellite-internet or space service, check whether the operator publishes its deorbit and tracking data.