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Supernova Light-Curve Time Dilation

Watch a distant Type Ia supernova's light curve stretch by a factor of (1+z) as photons ride an expanding metric — a real observational test that separates genuine cosmic expansion from the ruled-out 'tired light' hypothesis.

Space & Astronomy3DAdvanced60 FPS📱 Mobile-adapted⇄ 2D version

Cosmological redshift stretches more than just wavelengths — under a genuinely expanding metric it stretches time itself, so a distant, periodically brightening object appears to brighten and fade in slow motion by a factor of (1+z). This simulator flashes a nearby and a distant Type Ia supernova side by side, integrates the real flat-ΛCDM comoving-distance and luminosity-distance formulas for the chosen redshift, and plots both light curves live so you can watch the distant one stretch. A toggle switches to the historical "tired light" alternative — which predicted no time dilation at all — so you can see exactly which prediction real supernova surveys confirmed.

⚙ Under the hood

Watch a distant Type Ia supernova's light curve stretch by a factor of (1+z) as its light rides an expanding metric — a real observational test that separates genuine cosmic expansion from the ruled-out 'tired light' hypothesis.

cosmologysupernovaredshifttime-dilationexpanding-universelambda-cdm

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