Real physics, playable speed
Barnes–Hut gravity, symplectic integrators, and GPU compute keep a living universe honest — and fast enough to wander.
A grand stellar simulation · from Starhearth
From quarks to the cosmic web.
Every atom remembers.
Cosmogony is a universe biography you can stand inside: real gravity, honest time, and matter that carries its whole history — from the first light to the long dark.
rust · bevy · gpu compute · 660,000 stars and counting
The premise
A biography of a universe.
Begin at the beginning — a hot, smooth, expanding everything — and watch structure emerge on its own: the web, the galaxies, the stars, the slow chemistry of worlds.
There is no avatar and no rewind. You are a presence, not a character. Time only flows forward, and everything that happens, happened.
atom #4d3f92a1 · hydrogen ├ 13.79 Gyr — primordial, recombination ├ 9.42 Gyr — infall, protogalactic cloud ├ 7.18 Gyr — fused? no — solar wind, ejected ├ 3.90 Gyr — accreted, planetesimal └ today — ocean, somewhere warm
observation log · field build M0
Four laws of the build
Grand first. Honest always.
Every atom remembers
Matter carries provenance. Pick any star, any world, any atom, and unwind its whole story back to the first three minutes.
No avatar. No rewind.
You are a presence, not a hero. The universe doesn’t orbit you, and time never runs backward.
The dark sector
Most of everything is invisible. Dark matter scaffolds the web; dark energy stretches it. You’ll feel both long before you see either.
Field report
Now forming: the first galaxies.
- M0 · now
Foundations: gravity core, spiral arms, GPU splatting — a working galaxy of ~660,000 splats.
- palettes
Palettes are
.spraelfiles — art direction flows straight fromSprael, our pixel studio. - soon
Site + playable experiments.