Gravity! vs Gargantua

This app simulates the effects of gravity. You can fling particles at each other and watch them interact. Create solar systems and galaxies! Make a planet and fling asteroids into it! Add a black hole and watch everything get sucked in! You can adjust the size, mass, and color of the particles! Zoom in and out and look around with two fingers! App Preview Music: "Mesmerizing Galaxy " Kevin MacLeod (incompetech.com) Licensed under Creative Commons: By Attribution 4.0 License http://creativecommons.org/licenses/by/4.0/

Gargantua is a real-time galaxy-collision and supermassive-black-hole simulator that runs entirely on your device's GPU — and every pixel is driven by actual physics, not a pre-rendered animation. Spin up a spiral galaxy, smash two galaxies together and watch tidal tails and bridges form, or follow a pair of supermassive black holes as they spiral in, chirp, and merge into a spinning Kerr remnant. Then fly around a black hole and see its accretion disk wrap over the shadow in the gravitationally-lensed "Interstellar" view. REAL PHYSICS, LIVE • Newtonian N-body gravity with a Barnes-Hut octree, on Metal GPU compute • Exponential-disk galaxies with a true Freeman rotation curve and a persistent spiral density wave • Dark-matter halos, dynamical friction, SPH gas, radiative cooling, and star formation • Black-hole binary inspiral handoff to the analytic Peters chirp + Kerr remnant • Backward-ray-traced gravitational lensing (Schwarzschild to Kerr spin) with a Doppler-beamed disk MODES • Single spiral galaxy • Two-galaxy collision (stars, or full physics with gas + dark matter + black holes) • Supermassive black-hole merger finale, with a gravitational-wave ripple • Gravitational lensing — the black-hole shot TOUCH CONTROLS • Drag to orbit, pinch to zoom, two-finger pan • Live speed, pause, quality, and black-hole spin / accretion-disk controls • Tap Share to save or send a high-resolution image of your view Universal — looks gorgeous on iPhone and iPad.