SpaceSim: explore the universe in 3D

Explore a free 3D space simulator in your browser. Travel across the Solar System, change time, inspect source-backed worlds, and collect postcards.

Choose a live journey

Begin at the Sun, then follow a narrated journey across all eight planets.

Follow a pinned NASA trajectory from a co-located Earth-limb observer.

Tune a bounded stellar model and inspect how mass, heat, age, and family shape it.

Navigate the first published simulated image of a black hole with an accretion disk.

Open a known star or compact object in the experimental procedural stellar laboratory.