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18 physically accurate simulators for astronomy enthusiasts of all ages: black holes, gravitational waves, exoplanet transits, quantum tunneling, the HR diagram and more. Formulae, three explanation levels and interactive 3D visualization — right in the browser, no download.
🚀 Start the 3D universe
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Eclipse Simulator
Simulate solar and lunar eclipses with real Meeus algorithms. Lunar nodes, Saros cycle and
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Gravity & Orbits
N-body gravity simulator: Kepler orbits emerge from F=Gm₁m₂/r². Explore ellipses, chaos, a
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Black Holes & Hawking Radiation
Black holes, Hawking radiation and accretion disks: compute Schwarzschild radius, temperat
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Stellar Evolution
Stellar evolution interactive: set mass, read spectral class, lifetime and fate (white dwa
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Cosmic Expansion (ΛCDM)
Cosmic expansion in the ΛCDM model: simulate scale factor, Hubble parameter and CMB temper
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Special Relativity
Special relativity: visualize Lorentz factor, time dilation and length contraction with sy
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Gravitational Waves (LIGO)
Gravitational wave simulator: inspiral of two black holes, chirp mass, spacetime grid defo
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Exoplanet Transit (Kepler/TESS)
Exoplanet transit simulator: light curve, transit depth and impact parameter as used by Ke
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Double-Slit Experiment
Double-slit experiment: wave-particle duality live. Interference pattern builds hit by hit
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Tides & Tidal Bulges
Tides lab: two bulges from the gradient of lunar gravity. Spring and neap tides with Moon
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Radioactive Decay
Radioactive decay: 900 nuclei decay individually by quantum chance. Half-life law, activit
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Pulsar: Cosmic Lighthouse
Pulsar lab: neutron star spinning up to 716 times/s. Equatorial speed, rotational energy a
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Stellar Spectroscopy
Spectroscopy lab: Fraunhofer lines, Doppler shift and spectral classes O–M. Move stars and
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Hertzsprung-Russell Diagram
HR diagram interactive: click 16 real stars for details, animate evolution tracks. Main se
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Gravitational Lensing & Einstein Ring
Gravitational lensing lab: Einstein ring, microlensing light curve and Paczynski amplifica
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Quantum Tunneling
Quantum tunneling: wave function through barrier, exact T(E), WKB approximation. Alpha dec
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Planetary Atmospheres & Greenhouse Effect
Atmospheres lab: equilibrium temperature, greenhouse effect and Jeans escape. Compare Venu
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Nucleosynthesis: Origin of the Elements
Nucleosynthesis lab: origin of all elements, abundance chart, binding energy and r/s-proce