overview

cascade is a real-time 3D physics simulator that brings the kessler syndrome to life on your iPad and iPhone. it allows users to spawn satellites, trigger detonations, and watch debris cascade across low earth orbit in a stunning chain reaction — all powered by a custom physics engine running at 60 fps.

the simulation uses newtonian gravity, spatial hash collision detection, and instanced particle rendering to deliver a visually striking and scientifically grounded experience. users can adjust parameters like satellite count, debris density, explosion force, and orbital altitude to explore different scenarios.

the kessler syndrome itself is a theoretical scenario where the density of objects in low earth orbit is high enough that collisions trigger a self-sustaining cascade of debris. this distribution could render space activities and the use of satellites in specific orbital ranges difficult or impossible for many generations.

beyond the simulation, cascade features an eight-chapter educational section covering everything from orbital mechanics to remediation technologies. interactive charts, timelines, and causal flow diagrams made with Swift Charts make complex orbital science accessible and engaging.

winner of the Apple Swift Student Challenge 2026, cascade was built to spread awareness about this critical challenge facing our future in space: the sustainability of our orbital environment.

tech stack

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