# SpaceX's Orbiting Data Centers May Rain Harmless Debris > SpaceX claims Starmind satellites won't hit Earth with dangerous debris after re-entry, but experts warn of risks. - Title: SpaceX's Orbiting Data Centers May Rain Harmless Debris - Summary: SpaceX claims Starmind satellites won't hit Earth with dangerous debris after re-entry, but experts warn of risks. SpaceX's Starmind satellites could survive… - Keywords: spacex, starmind, starlink, federal communications commission, debris, re-entry, nfl, technology, SpaceX's, Orbiting, Data, Centers - Source: PCMAG — https://pcmag.com/news/will-spacexs-orbiting-data-centers-rain-debris-over-earth - Author: Michael Kan - Published: 2026-09-18T22:25:32+00:00 - Read time: 1 min - Topics: spacex, starmind, starlink, federal communications commission, debris, re-entry, nfl, technology ## SpaceX's Debris Plan SpaceX says Starmind satellites will break up in re-entry with no parts hitting Earth at over 15 joules of energy. > Based on this analysis, no portion of the spacecraft will impact the surface of the Earth with a kinetic energy above 15 joules: the Commission's limit under which a re-entering object presents no risk to humans. ## 15 Joules Safety Threshold The 15 joules limit is equivalent to a small hailstone falling from the sky, not causing injury in most cases. > Steel spheres with 15 joules or less of kinetic energy cannot cause an injury sufficient (in some limited cases) to require medical treatment. ## Satellite Components at Risk AI hardware, solar panels, and thrusters could survive re-entry at under 15 joules, while most parts burn up completely. > The components that could survive, but at under 15 joules, include the AI compute hardware, the solar panels, the thermal control system, the electronics related to avionics assembly, the thrusters, and the satellite aggregate. ## Satellite Size Concerns Each Starmind satellite weighs up to 4,000 kilograms, nearly 100 times heavier than a Starlink satellite. > A single Starlink V2 Mini Optimized satellite weighs about 575 kilograms, or 1,267 pounds. ## Debris Impact Risks Experts warn that even small debris could cause harm if it survives re-entry, as seen with a 2.5kg aluminum piece landing in Canada. > A 2.5kg piece of aluminum from a retired Starlink satellite survived re-entry and landed on farm grounds in Saskatchewan, Canada. ## SpaceX's Ocean Strategy SpaceX aims to dispose of satellites over oceans to minimize risks to populated areas. > SpaceX said a goal is to conduct targeted entry toward an ocean disposal, rather than over land. ## Expert Critiques Astronomers argue SpaceX's calculations are too optimistic and lack transparency for independent verification. > The casualty risk table is just nonsense. How does anyone double check their calculations? ## Orbital Congestion Risks With 1 million satellites, Starmind could cause collisions and orbital congestion, raising safety concerns. > SpaceX's analysis found that full-satellite probability of collision with large debris is below 0.001, but experts question the estimates. ## Ozone Depletion Risk Debris from satellites could release ozone-depleting chemicals, a concern scientists have called for study. > We have already seen large pieces of SpaceX debris survive atmospheric reentry and impact land in several parts of the world. ## Phased Deployment Plan SpaceX plans to launch Starmind satellites gradually to monitor atmospheric effects and reduce risks. > SpaceX told the FCC it's planning on a phased deployment approach for this system to monitor actual atmospheric effects. ## Satellite Retirement Strategy SpaceX aims to retire 80% of Starmind satellites into graveyard orbits to avoid atmospheric re-entry. > SpaceX has indicated it wants to retire about 80 percent of the Starmind constellation by moving the satellites into graveyard orbits around the Earth, or around the Sun. ## Key takeaway SpaceX's Starmind satellites could survive re-entry at under 15 joules of energy, deemed safe by the company but criticized by experts.