The Kessler Syndrome a cascade of orbital debris collisions that renders entire orbital shells unusable is not a science fiction scenario. It is an engineering risk being managed in real time by every satellite operator, astronaut, and space agency on Earth.
As of 2025, there are over 30,000 tracked debris objects in Earth orbit, and estimates suggest hundreds of thousands of untracked objects larger than 1cm each capable of destroying a satellite on impact. The orbital environment we operate in is already contested.
STELLAR's Design-for-Deorbit Philosophy
STELLAR treats space sustainability not as a regulatory compliance requirement, but as a design constraint that shapes every engineering decision. This starts with deorbit timeline.
The 25-year rule a voluntary guideline that satellites should re-enter the atmosphere within 25 years of end-of-life is not sufficient for the orbital altitudes where STELLAR operates. At 550km, natural orbital decay can take 25+ years even without intervention. We design for deorbit within 2 years.
Our satellites carry dedicated propulsion systems with fuel reserves specifically allocated for deorbit maneuvers. This is not the main propulsion system it's a separate, failure-redundant system with no other purpose than ensuring reliable deorbit at end of mission.
Collision Avoidance Architecture
Beyond deorbit, we implement a three-layer collision avoidance architecture:
Layer 1 Constellation Management: Our constellation is designed with orbital slots and spacing calculated to minimize conjunction probability. We coordinate with LeoLabs, ExoAnalytic, and government Space Fence operators for comprehensive tracking coverage.
Layer 2 Autonomous Avoidance: Each satellite carries an autonomous collision avoidance system that executes pre-planned maneuvers when conjunction probability exceeds thresholds without requiring ground station contact. Given our 10-minute ground contact windows, fully autonomous avoidance is not optional; it's required.
Layer 3 Post-Mission Disposal: At end of life, the satellite executes a controlled deorbit sequence that lowers perigee to ~200km, from which natural decay completes atmospheric entry within 30-60 days.
The Business Case for Sustainability
Space sustainability is also competitive differentiation. Institutional investors particularly the sovereign wealth funds and government entities that are STELLAR's target customers are increasingly requiring ESG compliance across their portfolio. A credible zero-debris commitment is not just the right thing to do; it's a sales asset.
We're investing in the long-term viability of the orbital environment we depend on. That investment pays returns across multiple dimensions regulatory, commercial, and ethical.