On Sept. 18, 2026, SpaceX submitted a 12-page technical response to the Federal Communications Commission (FCC) detailing atmospheric re-entry thermodynamics and orbital collision probabilities for its proposed “Starmind” space-based data center network.

The submission responds to formal FCC inquiries regarding the disposal safety, demise characteristics, and human casualty risks associated with retiring the 4,000-kilogram (4 metric ton) orbiting compute platforms.

Regulatory Context and Starmind Architecture

The safety filing supports SpaceX’s application to deploy and operate Starmind, a high-density Low Earth Orbit (LEO) constellation engineered to process artificial intelligence workloads in space. First submitted for regulatory review earlier in 2026, the Starmind architecture introduces significantly larger spacecraft than legacy telecommunications constellations. For comparison, an individual Starmind satellite features a mass nearly seven times greater than a 575-kilogram Starlink V2 Mini platform.

SpaceX’s filing outlines a phased deployment strategy designed to evaluate real-world atmospheric and environmental impacts during initial orbital operations. While lower-altitude spacecraft operating below 600 kilometers will undergo controlled de-orbit maneuvers over ocean disposal zones, SpaceX has requested regulatory approval to move higher-altitude units into graveyard orbits upon operational retirement.

Hardware Demisability and Kinetic Energy Parameters

The technical evaluation submitted to the FCC models the structural breakup and atmospheric destruction of key computing and satellite components during high-velocity re-entry. While major bus structural elements, primary propellant tanks, and optical laser communication terminals are expected to vaporize completely, SpaceX identified several dense internal components that could survive re-entry intact.

• Individual Spacecraft Mass: Up to 4,000 kilograms (4 metric tons) per Starmind node
• Surviving Component Categories: AI compute hardware modules, solar array segments, thermal management cooling loops, avionics assemblies, and electric thruster bodies
• Impact Energy Threshold: All surviving fragments are calculated to impact Earth’s surface with kinetic energy below 15 joules
• Casualty Risk Calculation: Zero aggregate human casualty risk under NASA Debris Assessment Software (DAS) standards, satisfying the FCC requirement of less than 1-in-10,000 (0.0001)
• Large Debris Collision Risk: Full-satellite collision probability with orbital debris measuring 10 centimeters or larger calculated at below 0.001 over operational lifespan

SpaceX noted that a 15-joule kinetic energy impact is equivalent to a 1.7-inch hailstone falling at terminal velocity, presenting no structural hazard to personnel or property on the ground.

Expert Critique and Orbital Risk Analysis

Independent space domain awareness experts and academic researchers have raised technical questions regarding SpaceX’s re-entry modeling and collision risk assumptions.

“My feeling is that SpaceX has tried to minimize the collision probabilities presented in response to the FCC’s question, but the approach is flawed,” said Hugh Lewis, professor of astronautics at the University of Birmingham. “I don’t think some of the satellites will meet the FCC large debris collision requirement.”

Researchers also highlighted potential deviations during atmospheric breakup. Aaron Boley, co-director of the Outer Space Institute at the University of British Columbia, noted that nested internal components and dense AI processing hardware create structural shielding during re-entry, which can prevent uniform thermal destruction and cause larger fragments to survive than predicted in idealized aerodynamic models. Additionally, orbital debris specialists cautioned that placing retired 4-ton data centers into LEO graveyard orbits could accelerate space junk accumulation, increasing long-term collision hazards for active Earth observation and science satellites.

Regulatory Schedule and Deployment Outlook

The Starmind application remains under active review by the FCC’s Space Bureau alongside interagency consultations with NASA and the Federal Aviation Administration. SpaceX maintains an operational target to initiate initial Starmind prototype launches as early as late 2027, subject to orbital debris mitigation approval and license issuance.