Perihelion vs Gravity Physics

Pilot a spacecraft through 8 hand-crafted orbital mechanics missions Pilot a spacecraft through 8 hand-crafted orbital mechanics missions - all powered by a live N-body gravity simulation using Velocity Verlet integration. Every burn matters. Fuel is finite. The universe does not care about your intentions. --------------- 8 MISSIONS --------------- Training - Learn the controls: fly through 5 gate checkpoints around Earth. Lunar Orbit - Launch from Earth and achieve a stable orbit around the Moon. Rendezvous - Dock with a moving space station by matching its velocity precisely. Jupiter Grand Tour - Orbit Io, Europa, and Ganymede - three separately stable orbits in one mission. Planetary Defense - Intercept an inbound asteroid and thrust it off its collision course with Earth. Perihelion - Burn deep into the inner solar system and fly through the Sun's gate at closest approach. Nebulon 5 - Thread through five massive plasma nebulas (instant death on contact) and dock with the gold asteroid at the centre. Three Body Problem - Navigate three mutually orbiting suns evolving in real-time chaotic N-body motion. --------------- FEATURES --------------- * Live N-body gravity simulation - Velocity Verlet integration * Live trajectory prediction - 500-step lookahead updates in real time * Time warp - 1x, 2x, 4x, 10x, 50x with sub-stepped physics * Three flyable spacecraft - Dart, Vanguard, and Atlas * Per-ship personal best times for every mission * Procedural planetary rendering - atmospheric glow, limb darkening, solar corona * Plasma nebula renderer - organic blob shapes with Hubble-style textures * No ads. No in-app purchases. No internet connection required.

Gravity is a real-time N-body physics simulation of our solar system — fly a spacecraft through accurately modeled orbits, gravity wells, and atmospheres, all rendered in a clean top-down view of the ecliptic plane. Every body uses real physical data: mass, radius, orbital elements, and atmospheric density where applicable. Gravity between all 26 bodies — Sun, planets, major moons, and dwarf planets — is computed live using velocity Verlet integration, so orbits, perturbations, and gravity assists emerge naturally from physics, not scripted paths. FEATURES • Pilot your own spacecraft — configure engine count, thrust, and mass, then launch from Earth • True N-body gravity — every body pulls on every other body and on your ship, in real time • Realistic atmospheric drag and heating — feel the difference between skimming Earth's atmosphere and diving into Venus or Saturn • Time controls — speed up months of orbital motion or slow down to precision-dock in real time • Trajectory prediction — see where your current heading will take you before you commit • Flight trail — trace your path across millions of kilometers • Extended telemetry — track speed, altitude, gravity, thrust-to-weight ratio, dynamic pressure, hull temperature, time dilation, and more Whether you want to attempt a Hohmann transfer to Mars, slingshot past Jupiter, or just watch the Moon orbit Earth in fast-forward, Gravity gives you a physically accurate sandbox to explore the mechanics of our solar system.