Solar System Sim
Space & Planet Physics Sandbox
Free · In-App Purchases · Designed for iPad. Not verified for macOS.
Zoom from a planet's surface out to distant galaxies, then reshape the whole system with your own hands.
Solar System Sim is a real-time gravity sandbox built on Newton's laws and real astronomical data. Every body you add, move or destroy recalculates the orbits of everything else, live.
• Smash worlds together: impact craters carve into the surface, firestorms sweep the globe, and glowing debris rains back down.
• Build your own universe: add planets, moons, asteroids and comets with their own size, mass and looks, or customise the ones already there.
• Land anywhere: drop to a first-person view on any planet's surface and experience its environment.
• Sculpt rings: add particle rings and watch gravity shape them in real time.
• Witness real eclipses: solar and lunar, with real-world astronomical precision.
• Follow comets: watch them streak past and interact with the bodies they meet.
• Leave the Solar System: travel to remarkable nearby stars and find them within the Milky Way.
• Feel the scale: see the true vastness of space, from a pebble-sized moon to the nearest galaxies.
Whether you're here to learn how gravity really works or just to break planets with it, explore at your own pace.
Start your cosmic adventure with Solar System Sim.
more • Voyager 1 & 2 as detailed 3D probes, dish aimed at Earth, Golden Record on board
• Zoom in to metres on small objects like the Voyagers
• Placing a small body flies the camera to it
• Black hole fixes
• Stars spin at their real speeds
• Recently added: gas giant impacts, spin flattening, tidal pull reshaping, 30 constellation stars, typable Find
• Fixes: labels up close, smoother stars on phones, crashes
0.428 4 days ago
• Gas giants: impacts now stir up the clouds and make the planet wobble
• Impacts on stars leave a dark mark
• Fast-spinning bodies flatten realistically, giants like the real ones
• 30 extra stars from the constellations (Orion, Big Dipper, Cassiopeia…); each card names its constellation
• Find: type a name to search
• All-new living stars and more realistic black holes
• Easier rotation period input
• Fixes: saves, impact marks and crashes
0.427 5 days ago
New in 0.422:
• Close binary stars: stars stretch into teardrops and pour gas onto their partners.
• Magnetars: five real magnetars with visible magnetic fields. Turn any neutron star into a pulsar or magnetar.
• New info card with composition and life probability for every body.
• Solar wind flowing around planetary magnetic fields.
• New systems in nearby galaxies, including SN 1987A.
• Nix, Hydra, new companion stars and better brown dwarfs.
• Many fixes and improvements.
0.422 24 Oct
What's new:
• Dozens of new nearby systems, with info cards (tap "I" next to the name)
• New comets: 67P, Swift-Tuttle & NEOWISE, with ion and dust tails
• Hear pulsars tick at their real rhythm when you come close
• Turn sunlike stars into red giants, then into white dwarfs
• Give any star a Kuiper belt, Oort cloud or custom nebula
• Redesigned orbit lines
• Smoother on phones, especially older devices
• Bigger, walkable impact craters with crater walls
• Supernova lag fix
• Many fixes
0.420 18 Oct
New: stellar evolution! Let stars grow into red giants that swallow their inner planets, then shed their envelope to leave a white dwarf and a planetary nebula.
Supernovae now leave a white dwarf, a pulsar or a black hole, depending on the star's mass.
Hear pulsars tick at their real rotation rate.
Explore 5 real nebulae in 3D: Crab Pulsar, Helix, Vela Pulsar, the Eagle with the Pillars of Creation, and the Homunculus.
Plus clearer buttons and many fixes.
0.416 12 Oct
• Nebulae! Explore 3D models of the Eagle Nebula with the Pillars of Creation, the Crab Pulsar and its nebula, the Helix Nebula, the Vela Pulsar with its supernova remnant, and the Homunculus Nebula around Eta Carinae. They are based on scientific data, with the missing parts filled in by artistic license :-)
• Find them in the new Nebulae list, or add any nebula to a star.
• Two new models: the International Space Station and the Space Shuttle.
0.413 8 Oct
New in this update:
• Fresh look: redesigned menus, panels and HUD
• New texture picker with live preview
• Premium: no ads, 20 save slots with screenshots, and import your own 3D models (GLB, OBJ, STL)
• New: the Starman Roadster and the Dagger space station
• Walk on small asteroids
• Impact craters now have raised rims, and the cloud blast works again
• Sharper shadows and eclipses
• Many fixes and performance improvements
0.411 6 Oct
* Particle Ball 2.0: turn almost anything into a particle ball: planets, moons, stars, asteroids, comets, spaceships and space stations
* Particle balls keep the shape and colours of the original object
* Much smoother switch to particle balls
* New Roche limit effects: a warning rumble and shaking ground, then dust jets, billowing clouds and a deep boom at the breakup
* Fixed custom textures save bug
* Various bug fixes
* Optimization
0.409 2 Oct
* Particle Ball 2.0: turn almost anything into a particle ball: planets, moons, stars, asteroids, comets, spaceships and space stations
* Particle balls keep the shape and colours of the original object
* Much smoother switch to particle balls
* New Roche limit effects: a warning rumble and shaking ground, then dust jets, billowing clouds and a deep boom at the breakup
* Fixed custom textures save bug
* Various bug fixes
* Optimization
0.408 30 Sept
• Particle Ball 2.0: turn almost anything into a particle ball - planets, moons, stars, asteroids, comets, spaceships and space stations
• Particle balls keep the shape and colours of the original object
• Much smoother switch to particle balls
• New Roche limit effects: a warning rumble and shaking ground, then dust jets, billowing clouds and a deep boom at the breakup
• Added a "Restore purchase" button to the menu
• Various bug fixes
• Optimization
0.407 29 Sept
• Particle Ball 2.0: turn almost anything into a particle ball - planets, moons, stars, asteroids, comets, spaceships and space stations
• Particle balls keep the shape and colours of the original object
• Much smoother switch to particle balls
• New Roche limit effects: a warning rumble and shaking ground, then dust jets, billowing clouds and a deep boom at the breakup
• Added a "Restore purchase" button to the menu
• Various bug fixes
• Optimization
0.406 26 Sept
• Particle Ball 2.0: turn almost anything into a particle ball - planets, moons, stars, asteroids, comets, spaceships and space stations
• Particle balls keep the shape and colours of the original object
• Much smoother switch to particle balls
• Added a "Restore purchase" button to the menu
• Various bug fixes
• Optimization
0.405 25 Sept
• Redesigned supernova model
• Supernova clouds now billow
• Added Turbulent visual mode for stars
• Added gravitational waves when black holes merge
• Fixed spaceship view
• Various bug fixes
• Optimization
0.404 16 Sept
• Redesigned supernova model
• Added Turbulent visual mode for stars
• Added gravitational waves when black holes merge
• Fixed spaceship view
• Various bug fixes
• Optimization
0.403 15 Sept
- Climate panel: ice caps, sea level, vegetation and volcanism
- You can now flood Earth completely and its city lights will go out when drowned or frozen.
- Heat map of local surface temperatures
- Impacts melt ice and scorch the ground
- 3D tsunamis adapt to environment
- Glowing lava lakes, even on cold worlds
- Correct °C/°F for your region
- Bug fixes
- Save/load fixes
0.401 25 Aug
- New Climate panel: set any planet's temperature, ice caps, sea level, vegetation and volcanism
- Watch it live: ice caps grow, seas drain, deserts spread, land melts
- Heat map of local surface temperatures
- Impacts melt ice and scorch the ground
- 3D tsunamis adapt to environment
- Glowing lava lakes, even on cold worlds
- Correct °C/°F for your region
- Save/load fixes
0.394 14 Aug
• 3D tsunamis after collisions
• 16 new moons for Jupiter and Saturn
• Irregular shapes for asteroids and comets
• 8 new bodies: ringed Quaoar & Chariklo, Orcus, Gonggong, Bennu, Ryugu, Eros, Kamo'oalewa
• 2 new comets
• Speed up to 2048x, backward time to -2048x (Kepler mode only)
• Orbit helper: force-lock moons
• More stable n-body mode, better performance
0.390 31 Jul
• 3D tsunamis after collisions
• 16 new moons for Jupiter and Saturn
• Irregular shapes for asteroids and comets
• 8 new bodies: ringed Quaoar & Chariklo, Orcus, Gonggong, Bennu, Ryugu, Eros, Kamo'oalewa
• 2 new comets
• Speed up to 2048x, backward time to -2048x (Kepler mode only)
• Orbit helper: force-lock moons
• More stable n-body mode, better performance
0.385 28 Jul
• 3D tsunamis after collisions
• 16 new moons for Jupiter and Saturn
• Irregular shapes for asteroids and comets
• 8 new bodies: ringed Quaoar & Chariklo, Orcus, Gonggong, Bennu, Ryugu, Eros, Kamo'oalewa
• 2 new comets
• Speed up to 2048x, backward time to -2048x (Kepler mode only)
• Orbit helper: force-lock moons
• More stable n-body mode, better performance
0.381 27 Jul
Planetary collisions just got a major upgrade!
- Impacts now carve real craters into the planet's surface
- Watch firestorms sweep across the world after a hit
- Glowing ejecta and debris rain back down from the blast
- Molten crater glow
- Smoother performance and faster startup, especially on older devices
- Various bug fixes and stability improvements
Thanks for playing! Keep the feedback coming.
0.374 6 Jul
- Added comet C/2024 E1 (Wierzchos): visible with binoculars/telescopes in early 2026 (best in the southern hemisphere).
- Added comet C/2025 R3 (Pan-STARRS): may become very bright in April 2026.
- Added comet C/2025 L1 (ATLAS): moving toward the inner Solar System, expected to brighten in spring.
- Fixed incorrect units in manual planet rotation input.
- Banned unskippable ads (hopefully for good!).
0.365 10 Feb
- Fixed supernova's bugged lighting
- Fixed planetary night lights staying on during daytime
- Increased memory page size
- Unity security fix
- Other bug fixes
0.364 23/10/2025
- Fixed supernova's bugged lighting
- Fixed planetary night lights staying on during daytime
- Unity security fix
- Other bug fixes
0.363 22/10/2025
- Adjusted 3I/ATLAS (interstellar comet) trajectory parameters from new available data.
- Improved shadows
- Bug fixes
0.360 06/10/2025
- Improved stability update
- Performance improvements for the n-body part of the simulation
- The simulation now runs much more smoothly when you select the "accurate orbits" option in the physics settings; when you select that option moons in tight orbits won't get flung out anymore
- Fixed "Seach" and "Replace by" functions
- Bug fixes
0.353 09/09/2025
• Voyager 1 & 2 as detailed 3D probes, dish aimed at Earth, Golden Record on board
• Zoom in to metres on small objects like the Voyagers
• Placing a small body flies the camera to it
• Black hole fixes
• Stars spin at their real speeds
• Recently added: gas giant impacts, spin flattening, tidal pull reshaping, 30 constellation stars, typable Find
• Fixes: labels up close, smoother stars on phones, crashes
more Version 0.428 4 days ago
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