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Hubble's Law — Expanding UniverseVary the Hubble constant and watch galaxies recede faster with distance, mapping redshift to… Exoplanet Transit — Detecting Planets via Light CurvesSet planet radius, orbital period and inclination, then read the transit dip in a star's… Big Bang Nucleosynthesis — First 20 MinutesFollow the first 20 minutes after the Big Bang: track the neutron-to-proton ratio and see… CMB — Cosmic Microwave Background Power SpectrumTurn the dials on baryon density, dark matter and the Hubble constant and watch the acoustic… Primordial Nucleosynthesis — Big Bang First 3 MinutesSet the baryon density and watch the first three minutes forge hydrogen, helium and lithium,… Gravitational RedshiftWatch a photon lose frequency escaping a gravitational well — compare two clocks and see… Schwarzschild GeodesicsLaunch particles or photons around a black hole and watch orbital precession, plunging… Dark Matter — Galaxy Rotation CurvesCompare the predicted Keplerian drop-off against observed flat galaxy rotation curves and… Galaxy Rotation Curves — Dark Matter EvidenceCompare the falling Newtonian prediction against observed flat galaxy rotation curves, built… Dark Matter HaloNewSet halo mass and concentration to shape the density profile and see how much dark matter… Cosmic WebNewLet gravity pull thousands of galaxies into filaments, sheets and clusters, leaving the vast… Galactic Rotation CurveAdd or remove the dark matter halo and see why stars in a galaxy's outskirts orbit far… Cosmic Inflation SimulatorNewWatch a grid of space expand exponentially fast during the inflationary epoch, then settle… Redshift & Doppler Shift VisualizerNewWatch a moving light source stretch or compress its wavefronts and see the resulting… Cosmic Distance Ladder SimulatorNewExplore stellar parallax, standard candles and Hubble's Law — the three rungs of the cosmic… Wormhole Spacetime VisualizerNewBend spacetime and watch a light ray cross a conceptual wormhole throat in this interactive… CMB Sky Map Simulation — Cosmic Microwave Background Temperature FluctuationsNewInteractive Cosmic Microwave Background (CMB) sky map simulation. Generate a procedural…