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Dark Matter Halo Around a Galaxy — Rotation Curve (3D)

A 3D spiral galaxy whose stars orbit under gravity from both the visible disk and a spherical dark-matter halo — toggle the halo off and watch the rotation curve fall off Keplerian instead of staying flat.

Cosmology3DModerate60 FPS📱 Mobile-adapted⇄ 2D version

Real spiral galaxies rotate almost as fast at their edge as they do near the core — far faster than the visible stars and gas alone could explain by Keplerian gravity. This simulator renders a 3D galaxy of orbiting stars and computes each one's circular speed from the combined gravity of an exponential visible disk and an adjustable spherical dark-matter halo, plotting the resulting rotation curve live so you can toggle the halo and watch the curve change shape.

⚙ Under the hood

A 3D galaxy of orbiting stars whose rotation curve stays flat with an adjustable dark-matter halo but falls off Keplerian when the halo is toggled off — drag to orbit, click a star, and reshape the visible and halo mass sliders.

dark-mattergalactic-rotationastrophysicsastronomyhalloween

3D · Three.js / WebGL renderer · 60 FPS target · runs fully client-side, no install