Interactive astronomy labs
22 interactive labs connect geometry, observation and physical models.
Celestial Sphere Explorer
Change observer latitude and sidereal angle to see how the celestial poles, horizon and a sample star move.
Connected topic: Celestial sphere02foundation labKepler Orbit Lab
Vary semimajor axis and eccentricity, then inspect periapsis, apoapsis and orbital period.
Connected topic: Kepler laws03foundation labInteractive H–R Diagram
Explore representative stars by temperature and luminosity and connect position to radius and stellar class.
Connected topic: Hertzsprung–Russell diagram04foundation labExoplanet Transit Lab
Change planet radius and orbital period to see the projected transit and synthetic light curve.
Connected topic: Transit method05foundation labHubble Expansion Lab
Adjust the Hubble constant and compare distance with recession velocity on a live graph.
Connected topic: Hubble–Lemaître expansion06advanced labGravitational Lensing Lab
Change lens mass and source alignment to visualize image splitting and the Einstein-ring scale.
Connected topic: Strong gravitational lensing07foundation labParallax Distance Lab
Grow the observing baseline and watch the parallax angle open; read the distance from p = b / d.
Connected topic: Trigonometric parallax08foundation labStellar Spectrum Lab
Slide the stellar temperature to shift the Planck peak and watch Balmer lines strengthen and fade across OBAFGKM.
Connected topic: Stellar spectra09advanced labCosmological Redshift Lab
Dial the redshift z to march spectral lines toward the red and read lookback time and comoving distance.
Connected topic: High-redshift galaxies10advanced labCompactness Scale Lab
Slide mass and radius to compare a body with its Schwarzschild radius and see where stars, white dwarfs, neutron stars and black holes lie.
Connected topic: Neutron stars11foundation labExoplanet Radial Velocity Lab
Change planet mass and semimajor axis to reshape the stellar wobble and read the RV semi-amplitude K.
Connected topic: Radial-velocity method12advanced labSupernova Light Curve Lab
Switch between Type Ia and Type II light curves and slide the distance to read the distance modulus and peak magnitude.
Connected topic: Type Ia supernovae13foundation labSolar System Orrery
Interactive 3D-style canvas simulation: Solar System Orrery.
Connected topic: Formation of the Solar System14foundation labBig Bang Expansion Timeline
Interactive 3D-style canvas simulation: Big Bang Expansion Timeline.
Connected topic: Discovery of cosmic expansion15foundation labSpacetime Warp Sandbox
Interactive 3D-style canvas simulation: Spacetime Warp Sandbox.
Connected topic: Black-hole thermodynamics16foundation labMilky Way 3D Model
Interactive 3D-style canvas simulation: Milky Way 3D Model.
Connected topic: Milky Way disk17foundation labEmission Nebula Lab
Interactive 3D-style canvas simulation: Emission Nebula Lab.
Connected topic: H II regions18foundation lab3D Orbital Elements
Interactive 3D-style canvas simulation: 3D Orbital Elements.
Connected topic: Orbital elements19foundation labPulsar Lighthouse
Interactive 3D-style canvas simulation: Pulsar Lighthouse.
Connected topic: Pulsars20foundation labAccretion Disk Viewer
Interactive 3D-style canvas simulation: Accretion Disk Viewer.
Connected topic: Accretion disks21foundation labCMB Sky Sphere
Interactive 3D-style canvas simulation: CMB Sky Sphere.
Connected topic: CMB anisotropies22foundation labGalaxy Cluster Fly-through
Interactive 3D-style canvas simulation: Galaxy Cluster Fly-through.
Connected topic: Galaxy clusters