---
title: "Universe Sandbox: Complete Guide"
game: "Universe Sandbox"
game_url: "https://qna.gg/games/universe-sandbox"
author: "Qloud"
author_url: "https://qna.gg/players/Qloud"
topics: ["Builds"]
summary: "A hands-on guide to Universe Sandbox: how the simulation works, how to build and break star systems, climate and surface tricks, 30 experiments worth trying, performance tips, and what's new in the Update 36 series.…"
url: "https://qna.gg/g/universe-sandbox-complete-guide-1c0084d5"
published: "2026-09-27T20:42:22.798Z"
updated: "2026-09-27T20:42:22.798Z"
source: "QnA.GG"
---

# Universe Sandbox: Complete Guide

A hands-on guide to Universe Sandbox: how the simulation works, how to build and break star systems, climate and surface tricks, 30 experiments worth trying, performance tips, and what's new in the Update 36 series.

*Researched September 2026 — current as of Update 36.3 "Crashing Craters" (August 2026). Universe Sandbox is still in Early Access and updates often; check the linked sources if something differs.*

## Quick Start

1. **It's a physics toy, not a game with goals.** There's no win state. You load or build a simulation, change something, and watch real physics play out.
2. **Start from a built-in simulation.** The Solar System and the historical/mission sims (Juno, New Horizons, Artemis II and more) are the best way to learn the interface.
3. **Time speed is your most important control.** Too slow and nothing happens; too fast and the simulation loses accuracy (orbits drift, collisions get missed). Adjust it constantly.
4. **Select an object, then edit its properties.** Mass, radius, velocity, rotation, temperature, composition and more are all editable, and changes take effect live.
5. **Add objects from the Add menu.** Stars, planets, moons, black holes, asteroids, comets, rings, spacecraft, and procedurally generated systems or galaxies.
6. **Use the tools.** Lasers, the collision tools, and the object duplicate button (new in 36.3) let you mess with things directly.
7. **Share on the Steam Workshop.** Save your creations and download thousands of others.
8. **It's Early Access.** The team is mid-way through a multi-year rewrite; expect changes, new features, and sometimes new bugs.

## How the Simulation Works

| System | What's simulated |
|---|---|
| Gravity | N-body Newtonian gravity between every object, at almost any speed |
| Collisions | Objects merge, fragment and leave molten craters; big impacts leave complex craters with a central peak (36.3) |
| Climate | Surface temperature, sea ice, seasons driven by axial tilt, oceans boiling away near a star |
| Composition | Twelve materials including water, oxygen and carbon dioxide; compositions can be set by percentage (36.2) |
| Atmosphere | Geostrophic winds spread gases across atmospheres (36.2); atmospheric drag burns up meteors (36) |
| Stars | Stellar evolution, flares and prominences, supernovae that leave remnants if massive enough (35.2) |
| Black holes | Light warping; they now lose mass through Hawking radiation (36.3) |
| Structure | Object cohesion based on composition, affecting deformation and fragmentation (36.1); objects stretch and deform near tidal locking (36) |

### What changed in 2025–2026
- **Update 35 (March 2025):** full graphics overhaul, a new dynamic interface that auto-positions and closes panels, multi-object editing.
- **Update 35.2 (June 2025):** supernova lighting and remnants.
- **Update 36 "Pale Blue DOTS" (March 2026):** physics rebuilt on Unity's Data-Oriented Technology Stack (DOTS) for performance; improved lasers that hit multiple objects and can push them with radiation pressure; meteors burning up in atmospheres; stretched and deformed objects.
- **Update 36.1 (April 2026):** Artemis II simulation and the Orion Integrity spacecraft; cohesion-based deformation.
- **Update 36.2 (June 2026):** atmospheric winds, shape-hugging selection outlines, composition by percentage, a **Rotating Camera** that locks to two selected objects, better stellar prominences, 50+ fixes.
- **Update 36.3 (August 2026):** realistic crater formation and blending, **Duplicate** objects (button or Ctrl+C / Ctrl+V on Windows, Cmd+C / Cmd+V on Mac), objects fade in and out when added/removed, black hole evaporation, a new exosatellite simulation, graphs that stay open.

## Interface Basics

- **Home** – load simulations, open the Workshop, change settings, and send feedback (Home, then Send Feedback).
- **Add** – choose an object type or a preset and click to place it. Many objects can be placed with a starting velocity.
- **Selecting** – click an object to select it. The properties panel shows what you can change.
- **Properties tabs** – editable settings are grouped (for example, Surface, then Atmosphere, then Geostrophic Wind Speed).
- **Tools** – lasers and other interaction tools.
- **Graphs** – plot values like temperature or distance over time. As of 36.3 they stay open and keep their data.
- **View options** – trails, labels, orbits and grids help you see what's happening.

Tip: the interface auto-manages panels since Update 35, so if a panel vanishes, it was closed to give the simulation room — reopen it from the object's selection.

## Time and Accuracy

This is the #1 source of "why did my system explode" confusion.

- **Faster time = bigger steps** between physics calculations. Close orbits (moons, binary stars) break down at high speeds.
- If orbits drift or objects fly off unexpectedly, slow down time.
- Big simulations with many particles or fragments slow everything down; reduce the number of objects or lower visual settings.
- The DOTS rewrite in Update 36 improves performance and is the foundation for further speed-ups.

## Things to Try (Experiments)

### Starter experiments
1. **Move Earth closer to the Sun** and watch the oceans boil away and surface temperature spike.
2. **Change Earth's axial tilt** and watch seasons and sea ice change.
3. **Delete the Sun** and see how the planets drift.
4. **Increase Jupiter's mass** until it rivals the Sun, then watch the inner planets destabilize.
5. **Add a black hole** passing through the Solar System.
6. **Crash the Moon into Earth** and look at the molten crater and debris.
7. **Spin a planet faster** until centrifugal force tears it apart.
8. **Give Earth rings** and watch how they behave.
9. **Laser a ring system** — since Update 36 the laser can blast multiple objects at once.
10. **Collide two stars** to trigger a supernova.

### Intermediate
11. **Add enough mass to a star** to push it into supernova, then check for a remnant.
12. **Duplicate the Moon** (36.3) and see if Earth can hold two.
13. **Terraform Mars** by adding water and adjusting the atmosphere composition.
14. **Recreate Titan's atmosphere** using the composition-by-percentage editor.
15. **Adjust wind speed** under Surface, Atmosphere, Geostrophic Wind Speed and watch gases spread.
16. **Run the Meteor Shower sim** and watch objects burn up with volatile trails.
17. **Watch a tiny black hole evaporate** from Hawking radiation.
18. **Select Jupiter and the Sun, then click Rotating Camera** to see the Trojan asteroids hold their positions relative to Jupiter.
19. **Fly along with Artemis II** in "Artemis II: Humanity's Farthest Journey" and recreate Earthset.
20. **Explore the exosatellite sim** of the brown dwarf CD-35 2722 b.

### Advanced
21. **Build a stable binary star system** with a habitable planet.
22. **Tidal locking:** push a moon closer and watch it deform.
23. **Roche limit:** bring a moon inside a planet's Roche limit and watch it break into a ring.
24. **Galaxy collision:** generate two galaxies and send them at each other.
25. **Spin up asteroid 2014 RC** and see how cohesion (36.1) now keeps it from immediately ripping itself apart.
26. **Planet formation:** scatter a cloud of small rocky objects around a young star and fast-forward to watch collisions merge them into bigger bodies (large particle counts are heavy — start small).
27. **Meteor bombardment:** send a stream of small rocks at a planet and study the crater field (36.3).
28. **Habitable zone test:** move a planet in steps and graph its temperature.
29. **Remove Jupiter:** delete it and watch long-term changes to the asteroid belt and the Trojans.
30. **Share it:** upload your best experiment to the Workshop.

## Workshop, VR and Platforms

- **Steam Workshop:** save and share simulations; browse thousands of community creations.
- **Platforms:** Windows, macOS and Linux. A VR mode exists; the official support pages point to a Steam Community VR controls guide.
- **Preview branch:** new features often land first on the `!preview-version` Steam beta branch — opt in via the game's Properties, then Betas in Steam.
- **Mobile:** an iOS and Android version is in development per the 2026 roadmap.

## Roadmap (as of August 2026)

Actively in development:
- True-shape object collisions with rigid-body physics (basic shapes like cubes and cylinders first)
- Foundational life simulation where life grows, dies and can be eaten
- Surface simulation performance improvements powered by DOTS
- Mobile version

Long-term goals include detailed planet surfaces you can fly over, custom planet maps and images, and building (and destroying) structures from small spacecraft to Dyson spheres.

## Common Mistakes to Avoid

- **Running time too fast.** The most common cause of weird orbits and missed collisions.
- **Adding huge numbers of particles** and wondering why frame rate collapses.
- **Forgetting to save** before a destructive experiment. Save a copy first so you can reload.
- **Editing the wrong object.** Check the selection outline (now shape-accurate since 36.2) before changing mass.
- **Expecting surface details to copy.** Duplicated objects don't yet copy detailed surface data; liquids and temperature spread evenly and may need time to settle (36.3).
- **Using Legacy guides.** "Universe Sandbox Legacy" is the old 2008 game; its keyboard reference doesn't apply to the current version.

## Advanced Tips

- **Graph everything.** Graphs turn a pretty visual into a real experiment — track temperature, distance, or velocity over time.
- **Use the Rotating Camera** for any co-orbital or resonant system.
- **Change one variable at a time.** Duplicate a system (or save copies) and change just mass, or just tilt, to see the effect clearly.
- **Reverse-engineer Workshop sims.** Open popular Workshop creations and inspect object properties to learn setups.
- **Send feedback in-game** (Home, then Send Feedback) if you find bugs; the team fixes a lot between updates.
- **Try the preview branch** if you want new physics early, but back up saves first.

## FAQ

**Is Universe Sandbox scientifically accurate?**
Gravity is real Newtonian N-body physics, and many other systems (climate, composition, stellar evolution) are modeled approximately. It's great for intuition and education, but it's not a research tool.

**Is Universe Sandbox the same as Universe Sandbox 2?**
Yes. The remake was renamed "Universe Sandbox" in December 2018, and the original became "Universe Sandbox Legacy."

**Why do my orbits break?**
Time is running too fast for the simulation's step size. Slow down.

**Is there VR support?**
Yes, VR is supported; see the Steam Community VR controls guide linked from the official support pages.

**Will it leave Early Access?**
There's no announced date. The team is doing a multi-year, piece-by-piece rewrite (graphics in 2025, physics in 2026), with life simulation, rigid-body collisions and mobile in progress.

**How do I duplicate an object?**
Select it and click Duplicate, or use Ctrl+C then Ctrl+V (Cmd on Mac). Added in Update 36.3.

**Is there a sale?**
It usually goes on sale around the Early Access anniversary each August; the 11-year anniversary sale ran through August 31, 2026.

## Sources

- [Universe Sandbox on Steam](https://store.steampowered.com/app/230290/Universe_Sandbox/)
- [Universe Sandbox Steam news (Updates 36 to 36.3, 2026 roadmap, anniversary)](https://store.steampowered.com/news/app/230290)
- [Universe Sandbox support](https://universesandbox.com/support/)
- [Universe Sandbox on Wikipedia](https://en.wikipedia.org/wiki/Universe_Sandbox)