Self-Hosted Digital Planetariums: Stellarium Web Engine vs OpenSpace vs Celestia

Introduction

Digital planetariums transform astronomical data into immersive 3D experiences, letting users explore the solar system, navigate between stars, and visualize cosmic phenomena from any vantage point in the universe. Whether you are an educator building a classroom astronomy lab, a museum creating interactive exhibits, or a hobbyist setting up a personal observatory, open-source planetarium software puts the cosmos at your fingertips.

This guide compares three leading open-source digital planetarium platforms — Stellarium Web Engine, OpenSpace, and Celestia — examining their rendering capabilities, data integration features, and self-hosted deployment options.

Stellarium Web Engine — Browser-Based Planetarium

Stellarium Web Engine is the JavaScript planetarium engine powering stellarium-web.org. It provides a full-featured planetarium experience directly in any modern web browser, making it the ideal choice for self-hosted educational deployments where users access the planetarium from their own devices.

Key capabilities:

• 600,000+ stars from multiple catalogs with proper motion
• Planets, moons, and solar system bodies with accurate positions
• Constellation lines, boundaries, and artwork overlays
• Landscape panoramas with customizable horizon profiles
• WMS (Web Map Service) layer integration for all-sky surveys
• Mobile-responsive interface with touch support
• Internationalization with 30+ languages

Self-hosted Stellarium Web Engine deployment:

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# Clone the web engine
git clone https://github.com/Stellarium/stellarium-web-engine.git
cd stellarium-web-engine

# Install dependencies
npm install

# Build for production
npm run build

# Serve with Nginx
cp -r dist/* /var/www/stellarium/

Nginx configuration:

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server {
    listen 80;
    server_name planetarium.yourdomain.com;

    root /var/www/stellarium;
    index index.html;

    location / {
        try_files $uri $uri/ =404;
    }

    location /api/ {
        proxy_pass http://localhost:8090;
    }

    # Cache static assets
    location ~* \.(js|css|png|jpg|svg|woff2)$ {
        expires 30d;
        add_header Cache-Control "public, immutable";
    }
}

Docker Compose deployment:

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version: "3.8"
services:
  stellarium:
    image: nginx:alpine
    ports:
      - "8080:80"
    volumes:
      - ./stellarium-dist:/usr/share/nginx/html
      - ./nginx.conf:/etc/nginx/conf.d/default.conf
    restart: unless-stopped

OpenSpace — Professional Astrovisualization

OpenSpace is an open-source astrovisualization platform developed through a collaboration between the American Museum of Natural History, NASA, Linköping University, and other institutions. Designed for museum fulldome theaters and interactive exhibits, OpenSpace renders the known universe using real scientific data from NASA missions and astronomical surveys.

Key capabilities:

• Gaia DR3 star catalog with 1.8 billion stars
• Real-time spacecraft trajectory visualization from NASA SPICE kernels
• Planetary terrain rendering with high-resolution elevation data
• Volumetric rendering for nebulae and galaxies
• Fulldome projection for planetarium theaters
• Multi-touch and game controller navigation
• Lua scripting for automated presentations and kiosk mode
• Remote control via Web GUI for exhibit operators

Installing OpenSpace on Linux:

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# Download from GitHub releases
wget https://github.com/OpenSpace/OpenSpace/releases/latest/download/OpenSpace-latest-linux64.tar.gz
tar xf OpenSpace-latest-linux64.tar.gz
cd OpenSpace

# Launch in kiosk mode for museum exhibits
./bin/OpenSpace --profile museum --kiosk

For synced multi-projector dome setups:

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# Master node
./bin/OpenSpace --profile dome --sync master

# Slave nodes (one per projector channel)
./bin/OpenSpace --profile dome --sync slave --host master-ip

OpenSpace profile configuration example:

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-- profiles/museum.profile
asset.require("scene/solarsystem")
asset.require("scene/milkyway")
asset.require("scene/universe")

-- NASA mission data
asset.require("spice/new-horizons")
asset.require("spice/juno")
asset.require("spice/jwst")

-- Render settings
openspace.setPropertyValue("NavigationHandler.OrbitalNavigator.Anchor", "Earth")
openspace.setPropertyValue("RenderEngine.ShowStarlabels", true)
openspace.setPropertyValue("RenderEngine.ConstellationLines.Enabled", true)

Celestia — Real-Time 3D Space Simulator

Celestia is a real-time 3D space simulation that lets you travel anywhere in the known universe. Unlike a traditional planetarium that views from Earth, Celestia is a full spaceflight simulator — you can orbit Saturn’s rings, fly between Jupiter’s moons, or visit exoplanets orbiting distant stars.

Key capabilities:

• Procedural generation of planetary surfaces based on real data
• Extensive addon system with 10,000+ community-created additions
• Scriptable guided tours via Celx/Lua scripting
• Time control: accelerate, reverse, or freeze time
• Star catalog extensible to billions of stars through addons
• Exoplanet catalog with 4,500+ confirmed exoplanets
• Educational overlays (orbits, labels, coordinate grids)

Self-hosted Celestia with web-based remote control:

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# Install Celestia
sudo apt-get install celestia

# Install Lua addons for enhanced features
git clone https://github.com/CelestiaProject/CelestiaContent.git
cp -r CelestiaContent/* ~/.celestia/

# Launch with scripting
celestia --url http://localhost:8888

For automated kiosk displays:

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-- Celestia tour script (tour.celx)
celestia:settimescale(1000000)  -- 1 million times faster

-- Visit Jupiter
celestia:select(celestia:find("Sol/Jupiter"))
celestia:goto(celestia:find("Sol/Jupiter"), 5)
wait(10)

-- Visit Saturn
celestia:select(celestia:find("Sol/Saturn"))
celestia:goto(celestia:find("Sol/Saturn"), 5)
wait(10)

-- Travel to Andromeda
celestia:gotolonglat(celestia:find("M 31"), 0, 0, 1e6, 5)
wait(15)

Docker deployment for headless Celestia:

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version: "3.8"
services:
  celestia-headless:
    image: ubuntu:24.04
    volumes:
      - ./data:/data
      - ./scripts:/scripts
      - ./output:/output
    command: >
      bash -c "apt-get update && apt-get install -y celestia &&
               celestia --once --url /data/solarsystem.cel --screenshot /output/frame.png"

Why Self-Host Your Digital Planetarium?

Self-hosting a digital planetarium gives educators and museums complete control over the presentation experience. Commercial planetarium software licenses for dome theaters cost $5,000-$20,000 per year, plus additional fees for data updates and feature unlocks. Open-source alternatives provide the same astronomical accuracy at zero licensing cost, with the flexibility to customize the experience for specific educational curricula or exhibit themes.

For amateur astronomers and astrophotographers, a self-hosted planetarium provides planning tools without cloud service dependencies. You can plan observation sessions offline, simulate telescope fields of view, and integrate with equipment control software — all on your local network. See our telescope mount GoTo systems guide for connecting your planetarium software to motorized telescope mounts.

For researchers and data enthusiasts, the integration capabilities of these tools with scientific data formats are invaluable. Our guides on astronomy data processing and satellite ground station tracking cover the complete workflow from raw astronomical data to interactive 3D visualization.

FAQ

How accurate are these planetariums compared to real sky observations?

All three engines use JPL/NASA ephemeris data for solar system body positions, providing arcsecond-level accuracy for planets and moons. Stellarium Web Engine and OpenSpace use Gaia DR3 for stellar positions with milliarcsecond precision. Celestia uses Hipparcos by default but supports Gaia catalogs through addons. For casual observation, the star positions are visually indistinguishable from real sky views.

Can I project these on a planetarium dome?

OpenSpace has native fulldome projection support with multi-projector synchronization for professional dome theaters (up to 8K resolution per channel). Celestia can be configured for fisheye projection but requires external warping/blending for multi-projector setups. Stellarium Web Engine is designed for flat-screen web browsers and does not have native dome projection capabilities.

How much storage do I need for high-resolution data?

A basic Stellarium Web Engine deployment uses ~200MB. OpenSpace with full Gaia DR3, terrain data, and mission datasets requires 200-500GB. Celestia core is ~50MB, but addons (high-res textures, galaxy catalogs) can easily reach 100GB+. Plan for at least 500GB dedicated storage for a production-quality OpenSpace installation.

Can students and visitors interact with these on their own devices?

Stellarium Web Engine is inherently multi-user — any device with a web browser can access it simultaneously. OpenSpace supports multi-touch screens and game controllers for public kiosk installations, plus a web-based remote control interface. Celestia is single-user by default but can be deployed with VNC or web-based remote control wrappers for classroom settings where the instructor navigates while students view.

What is the best choice for a school astronomy club?

For maximum accessibility, start with Stellarium Web Engine — students can access it from Chromebooks, tablets, and phones without installing any software. Add Celestia on a shared workstation for spaceflight simulations and 3D exploration. If the school has a dedicated astronomy lab with a projector, OpenSpace provides the most professional presentation experience with scripted shows aligned to curriculum standards.

How do I create custom guided tours or educational presentations?

OpenSpace uses Lua scripts called “profiles” that define camera paths, narration timings, and data layers. Celestia uses Celx scripts for guided tours with time controls and camera paths. Stellarium Web Engine supports JavaScript-based plugins for custom overlays and interactive experiences. All three platforms have active educator communities sharing pre-made tours and lesson plans.

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