Solar System Sim0.416 - App Store

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.

Version History 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 22h ago • 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 4d ago 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 6d ago * 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 Oct 2 * 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 Sep 30 • 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 Sep 29 • 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 Sep 26 • 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 Sep 25 • 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 Sep 16 • 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 Sep 15 - 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 Aug 25 - 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 Aug 14 • 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 Jul 31 • 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 Jul 28 • 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 Jul 27 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 Jul 6 - 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 Feb 10 - 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 10/23/2025 - Fixed supernova's bugged lighting
- Fixed planetary night lights staying on during daytime
- Unity security fix
- Other bug fixes 0.363 10/22/2025 - Adjusted 3I/ATLAS (interstellar comet) trajectory parameters from new available data.
- Improved shadows
- Bug fixes 0.360 10/06/2025 - 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 - 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 0.352 08/06/2025 - Added a surface temperature option (from the textures menu p.7) for each planet. For Earth, it's activated by default. Earth will freeze when its cold, and its water will evaporate when its hot.
- You can change the temperature texture settings using the sliders menu on the right 0.350 04/16/2025 - You can now add magnetospheres to planets using the textures menu. Stars produce stellar winds that deform the magnetospheres.
- In the physics menu, you now have the option to prioritize simulation accuracy over speed. It will prevent objects getting flung out of orbit during time acceleration, but may cause extra lag.
- Switched from Euler to leapfrog integration for the n-body calculations. It should result in more stable orbits. 0.346 03/27/2025 - Fixed Mars texture
- Bug fixes 0.344 02/26/2025