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LESSON 06 OF 6

Debris mitigation (guidelines & tech)

Beginner ~7 min Slide deck Free

Debris mitigation is the collective effort to slow the growth of orbital debris through design standards, operational practices, and — eventually — active removal. The guidelines exist. Compliance is improving.

Debris mitigation is the collective effort to slow the growth of orbital debris through design standards, operational practices, and — eventually — active removal. The guidelines exist. Compliance is improving. But the gap between what's needed and what's happening is still significant.

What this lesson covers

The 25-year rule (and its successor)

The most widely referenced guideline: satellites in LEO should deorbit within 25 years of end-of-mission. But this is changing.

Passivation: preventing explosions

The single most effective debris prevention measure: deplete all stored energy at end of mission so the satellite or rocket body can't fragment later.

Active Debris Removal (ADR)

Prevention alone won't solve the problem — models show we need to remove 5–10 large objects per year from congested bands to stabilise the environment.

Mitigation progress

Compliance with deorbit guidelines is improving but far from universal. Meanwhile, the most dangerous debris (large intact objects at 800+ km) requires active removal — a technology that's still in demonstration phase.

Key facts

💡The 25-year rule is increasingly seen as too lenient. 5 years is the new target — and some operators already comply.
Prevention (deorbit rules, passivation) slows the growth. Active removal is needed to reverse it.

The debris problem has a two-part solution: stop adding new long-lived debris, and start removing the most dangerous existing objects. Both are technically feasible — the remaining challenges are economic and political.

All lessons in Debris & Re-entry
01What counts as debris~7 min02Conjunctions (close approaches)~7 min03Re-entry prediction (why it shifts)~7 min04Kessler Syndrome (the cascade risk)~6 min05Notable debris events (history)~6 min06Debris mitigation (guidelines & tech)~7 min
← Notable debris events (history)All 6 Lessons
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