Early buildJUL 2026 · Simulation · Space

SpaceSim

A real-scale Solar System explorer, sourced instead of guessed.

A free 3D space simulator in the browser. Travel across the Solar System, change time, inspect source-backed worlds and collect postcards. Distances are honest: planets shrink to dust once the scale is real.

Status
Early build
Platforms
Browser
Genre
Simulation · Space
Price
Free
Earth seen from orbit with the Saturn postcard preview.

Choose a live journey

Begin at the Sun and follow a narrated Grand Tour of all eight planets. Ride a pinned NASA trajectory aboard the ISS. Tune a bounded stellar model. Or navigate Jean-Pierre Luminet’s first published simulated image of a black hole.

The SpaceSim home: Solar System, ISS, star lab and black hole journeys.

Sourced, not guessed

Worlds, orbits and observers come with explicit scientific provenance. Shared UTC keeps every visitor on the same clock. The atlas keeps growing: stars, compact objects and new journeys keep landing.

SpaceSim cover art

In the box

  • Real-scale Solar System
  • Narrated Grand Tour
  • ISS observer on a NASA trajectory
  • Luminet black hole
  • Shared UTC clock
Play the early build

In your browser · No download · Free

Questions

What is SpaceSim?

A free 3D space simulator that runs in your browser. You travel across a real-scale Solar System, change time, inspect source-backed worlds and collect postcards.

Is SpaceSim real scale?

Yes. Distances are honest, so planets shrink to dust once the scale is real. Worlds, orbits and observers come with explicit scientific provenance.

What journeys can I take?

A narrated Grand Tour of all eight planets, the ISS on a pinned NASA trajectory, a bounded stellar model, and Jean-Pierre Luminet’s first published simulated image of a black hole.

Is SpaceSim finished?

No. It is an early build: the atlas keeps growing with new stars, compact objects and journeys.

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