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🌌 Expanding Universe: Friedmann Model on a 2D Map

Interactive 2D map of cosmic expansion in a Friedmann (Lambda-CDM) universe: comoving galaxies on a growing grid, the Hubble sphere where recession speed reaches c, a live a(t) graph and a draggable matter / dark-energy parameter plane that shows whether the universe expands forever or recollapses.

Physics & Mechanics2DModerate60 FPS📱 Mobile-adapted⇄ 3D version

Details

CategoryPhysics & Mechanics

RenderingCanvas 2D

DifficultyModerate

Target FPS60

ControlsSliders for H0, matter density and dark-energy density plus a draggable dot on the Omega-matter / Omega-Lambda plane, six cosmology presets, time speed and galaxy count; drag the orange Hubble-sphere edge to change H0, tap a galaxy to measure its recession speed, drag to pan and scroll or pinch to zoom.

cosmologyfriedmann equationsdark energyhubble sphereexpansion of the universe

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⚙ Under the hood

cosmologyfriedmann equationsdark energyhubble sphereexpansion of the universe

2D · HTML5 Canvas 2D · 60 FPS target · runs fully client-side, no install