Exoplanet Transit Simulator
See how a planet's size and orbit shape a transit light curve, with limb darkening and optional noise.
Open Exoplanet Transit SimulatorFree astronomy simulations
Interactive, physics-based tools for students, teachers and enthusiasts. Free to use in class — a link back is appreciated.
The interactive versions are in development. Each page already explains the physics, with diagrams, worked numbers and classroom exercises.
Blackbody Spectrum & HR Diagram
Set a star's temperature and radius; watch its Planck spectrum and its place on the HR diagram.
Open Blackbody Spectrum & HR DiagramKepler's Laws Orbit Simulator
Stretch an orbit, change the central mass and see equal areas swept out in equal times.
Open Kepler's Laws Orbit Simulator