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Spiral Galaxyპოპულარული80,000 stars forming a spiral galaxy with arms, nebulae and a central bulge using instancing. N-Body GravityპოპულარულიGravitational interaction of hundreds of bodies via Leapfrog integrator. Galaxy disk… Solar System8 planets with realistic orbits, moons, Saturn's rings and the asteroid belt. Click a planet… Kepler Planets8 planets with real orbital radii and periods. Asteroid belt, rings, click to focus on a planet. Orbital MechanicsN-body Velocity Verlet integrator. Three scenarios: inner Solar System, Lagrange Points with… Star EvolutionAnimated stellar lifecycle from molecular cloud to white dwarf / neutron star / black hole,… Lagrange PointsVisualise the five Lagrange points of a two-body system (Sun–Earth, Sun–Jupiter, Earth–Moon,… Solar System for KidsA fun, colourful solar system for young explorers — planet names, sizes and distances… Binary StarsTwo stars orbiting their common centre of mass with Velocity Verlet integration. Visualises… Meteor ShowerWatch a stunning meteor shower with realistic glowing trails, draggable radiant point, and… Gravitational LensingMove a foreground mass across a background quasar and watch curved spacetime bend its light… Aurora Borealis — Charged Particles in Earth's MagnetosphereFire solar wind particles at Earth's magnetosphere and follow the Lorentz force spiralling… Solar Wind & Earth's Magnetosphere — Bow Shock, Magnetopause, AuroraParticle simulation of the solar wind interacting with Earth's magnetic dipole. Bow shock,… Kármán Line — Where Does Space Begin?Interactive simulation of the Kármán Line at 100 km altitude. Explore atmospheric density,… N-Body Gravitational Simulation — Orbits, Collisions & SlingshotsInteractive N-body gravitational simulation with RK4 numerical integration. Add custom… Orbital Mechanics — Gravity Assist & Lagrange PointsSimulate gravitational slingshot manoeuvres and explore the 5 Lagrange points of a two-body… Space Telescope — L2 Lagrange Point & Halo OrbitInteractive simulation of a space telescope at the Sun-Earth L2 Lagrange point. Visualize… Stellar Evolution — From Nebula to SupernovaExplore the full life cycle of stars — from molecular cloud to main sequence, red giant, and… Satellite ConstellationNewSet planes, satellites per plane, inclination and altitude to build a Walker constellation… SupernovaNewChoose a progenitor mass and watch a massive star collapse, rebound and blow off its… Tidal ForcesNewMove a moon inside the Roche limit and watch the difference in gravity across it stretch,… Solar Flare & CMENewMagnetic reconnection on the Sun releases stored energy as a flare (classed A-X by X-ray… Gravitational Waves — Binary Inspiral & LIGO DetectionNewSimulate a binary black hole inspiral: watch the chirp waveform grow in frequency and… Radio Telescope ArrayNewInterferometry & aperture synthesis: a baseline B gives angular resolution θ≈λ/B, and… Tidal LockingNewSee how tidal forces synchronise a moon rotation to its orbital period — spin down to the… Planetary FormationNewSimulate accretion disk dynamics and planetesimal collisions — watch dust grains clump into… Ocean TidesNewThe Moon and Sun raise tidal bulges on Earth; their alignment drives spring and neap tides.… Orbital ResonanceNewWhen orbital periods lock to integer ratios, gravity tugs sum coherently. Watch 3:2, 2:1,… Van Allen BeltsNewEarth's dipole traps charged particles on bouncing helical paths. Watch protons and… Planetary RingsNewThousands of Keplerian particles around a planet self-organize. Inside the Roche limit they… Warp Speed StarfieldNewWarp-speed starfield — thousands of stars streak radially outward as you jump to light speed. PulsarNewSpin up a neutron star and tilt its magnetic field: drag the period and B-field sliders and… Black Hole ThermodynamicsNewSet a black hole's mass and spin (Kerr parameter a/M) and watch its Hawking temperature and… Restricted Three-Body Problem — Roche LobesNewA test particle moves under two massive primaries orbiting their barycentre. Explore… Lagrange Points — Stability & Halo OrbitsNewPlace test masses at L1-L5 equilibrium points of the Earth-Sun system: L4 and L5 are stable… Magnetic Reconnection — Solar Flares & SubstormsNewOppositely directed magnetic field lines break and reconnect at an X-point, explosively… Dynamo Effect — How Planets Make Magnetic FieldsNewA self-sustaining dynamo: convecting electrically conducting fluid in a rotating planetary… Hall Effect Thruster — Ion PropulsionNewSimulate ion acceleration in a Hall effect thruster. Electrons spiral in E×B drift, ionizing… Cosmic Ray Air Shower — Particle CascadeNewWatch a cosmic ray proton cascade into thousands of secondary particles (pions, muons,… Stellar Interior StructureNewSolve the stellar structure equations (mass, pressure, luminosity, temperature gradients)… White Dwarf Cooling — Mestel TheoryNewMestel cooling: L ~ T^(7/2) for a crystallizing white dwarf. See the cooling track L(t) ∝… Exoplanet Transit Light CurveNewAn exoplanet crosses its host star blocking Δ(F/F_star) = (R_p/R_star)² of starlight. Adjust… Meteor Entry & AblationNewA meteoroid enters the atmosphere: drag, ablation, and luminous efficiency govern the light… Relativistic Radio JetNewAn AGN launches a relativistic jet. Relativistic Doppler boosting: S_obs = S_em · δ^(3+α)… Kuiper Belt ExplorerNewExplore thousands of icy Kuiper Belt Objects orbiting beyond Neptune, including Pluto-like… Asteroid Belt DynamicsNewWatch thousands of asteroids orbit the Sun and see the Kirkwood gaps carved out by Jupiter's… Oort Cloud & Long-Period CometsNewWatch passing stars gravitationally perturb icy bodies in the distant Oort Cloud, sending… Comet Tail FormationNewWatch a comet's curved dust tail and straight ion tail form and grow as it swings around the… Galaxy Rotation CurvesNewCompare a spiral galaxy's observed flat rotation curve to the Keplerian curve predicted by… Chandrasekhar Limit SimulatorNewAdd mass to a white dwarf and watch it collapse into a supernova or neutron star once it… Neutron Star Merger & KilonovaNewWatch two neutron stars spiral together under gravitational-wave loss, merge, and blast out… Magnetar Starquake & FlareNewWatch an ultra-magnetized neutron star's field lines crack, reconnect, and erupt in a giant… Brown Dwarf Classifier & CoolingNewAdjust mass to classify a brown dwarf, star, or giant planet, and watch its cooling curve… Protoplanetary Disk & Planet FormationNewWatch dust accrete into planetesimals and clear gaps in a rotating protoplanetary disk… Roche Limit Tidal DisruptionNewWatch a moon stretch and shatter into a debris ring as it crosses the Roche limit around a… Gravitational Slingshot — Gravity AssistNewWatch a spacecraft's speed and path change during a gravity assist flyby of a moving planet,… Habitable Zone CalculatorNewAdjust star mass and planet orbital distance to see the circumstellar habitable zone shift,… Exoplanet Classification ExplorerNewAdjust mass, radius and orbital distance to plot a hypothetical exoplanet and see it… Kepler Orbits — Elliptical Planetary MotionNewSimulate a planet orbiting a star under Newtonian gravity with RK4 integration. 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