TO THE SPACE / THE SCIENCE BEHIND THE SIMULATION
An orbital data center places computing hardware on satellites. This independent educational simulator lets you explore how sunlight, heat rejection and communications constrain the AI computation a constellation could provide.
Solar arrays convert sunlight into electricity for computers and spacecraft systems. A dawn–dusk sun-synchronous orbit can stay in near-continuous sunlight; in other orbits, batteries must bridge Earth’s shadow or computing must slow down. Compare both geometries in the simulator, then use Mission Lab to investigate battery reserves over several orbits.
Vacuum offers no air to carry heat away. Heat from computing hardware must reach radiators and escape as infrared radiation. Radiator area, the temperature the chips can tolerate and the infrared glow absorbed from Earth limit sustained compute power; cold space does not make cooling free.
The model converts available electrical and thermal power into illustrative arithmetic throughput, using configurable chip efficiency and utilization. FLOP/s measures floating-point operations per second. It does not directly measure intelligence, tokens per second or the performance of a tightly connected training cluster.
Laser terminals could relay data to other satellites, including a Starlink-style relay constellation. Links require precise pointing and an unobstructed line of sight. Network capacity and ground access can constrain useful workloads even when computing power is available. The displayed fleet and beams are illustrative, not live tracking.
Every kilowatt needs solar arrays, radiators, batteries and structure, so mass sets how many spacecraft fit on each launch. Altitude is a trade: lower orbits meet more atmospheric drag and need regular re-boosting, while higher orbits face more trapped radiation and keep a failed spacecraft in orbit for decades unless it carries propellant for a deorbit burn.
Use the Earth Explorer to preview and deploy compute satellites. Open Mission Lab to test eclipses, batteries and AI workloads. Explore Anatomy to examine solar arrays, compute hardware, radiators and optical terminals. The Learning Academy offers guided predictions and experiments.
Return to the interactive simulator ↑To the Space is an independent learning project, not affiliated with or endorsed by SpaceX. The hardware is conceptual and the estimates are educational, not mission predictions. Explore the proposal on SpaceX’s Starmind page and engineering context in NASA’s spacecraft thermal-control guide. The simulator’s Sources panel explains its equations and assumptions.