CRASH Clock: LEO collision-avoidance windows compressed to days (2.8–5.5) as constellations surge

The 'CRASH Clock' quantifies expected time to a collision in low Earth orbit if avoidance maneuvers stopped. As of June 2025 researchers place that window at roughly 2.8–5.5 days — down from 164 days in January 2018 — driven by mega-constellation deployments and emerging 'space data centers'.

Discovered 2025-12-18T02:15:42.292388-08:00 | 2025-12-18T02:15:42.292388-08:00

Briefing

What Hype is tracking

Collision-avoidance windows in LEO have collapsed to roughly 2.8–5.5 days (from 164 days in Jan 2018), sharply increasing the chance of close approaches, service disruption and cascading debris; the trend is linked to the recent surge in satellite launches.
Extreme space-weather can precipitously shorten margins to ~2.8 days; regulators and operators are already moving to test resilience — see the ESA requirement for solar-storm simulations.
Actionable mitigations exist: targeted removal of ~50 high-risk objects could cut LEO collision risk by ~50% and collision-avoidance services are being embedded into fleet-management stacks to reduce on-orbit risk (removing ~50 objects; collision-avoidance integration).

Reported By

newspaceeconomy.ca The Verge Space.com Scientific American Times of India