About CosmosForge Play
How it works
CosmosForge teaches astrophysics the way astronomers actually build understanding: from real data and real measurements, at scales of space and time that dwarf everyday life.
- Stellar Evolution — step through a star's ten life stages, each drawn at its true relative size and color, then order the lifecycle and discover that a star's fate branches on its mass.
- Black Hole Explorer — drag the mass and watch the event horizon, photon sphere, and innermost stable orbit scale together, using the same Schwarzschild physics as the iOS app.
- Cosmic Distance Ladder — climb the four techniques astronomers stack to measure the universe, from parallax to redshift, with a real example object on every rung.
- Concept kits — 16 short question rounds, from the solar system out to cosmology and the Big Bang.
Our privacy promise
CosmosForge Play is free, works offline, and collects nothing. No accounts, no ads, no tracking, and no data ever leaves your device — your progress, level, and streak are saved only in this browser.
Mistakes are part of it
You never lose anything for a wrong try. Wrong answers get a gentle explanation, and hints teach you how to reason — not just the answer. The universe is strange; being surprised is exactly how the pros learn too.