Educational content and simulations
Our tools are for learning. They are not for navigation, mission planning or engineering.
Draft. This text is pending review by counsel and may change before it takes effect.
Simulations are approximations
Results from our tools (orbits, trajectories, delta-v, timings, positions) are approximations from simplified models, intended for learning only. They must not be used for navigation, mission planning, safety-critical, operational, commercial or engineering decisions.
We check our calculations against authoritative reference data such as JPL Horizons, and every lesson lists its sources. Even so, simplified models leave out effects that matter in real missions.
Knowledge changes
Scientific knowledge changes; figures may be outdated or disputed. If you find an error, please tell us through the contribution board.
Certificates
Certificates of completion are free, non-accredited acknowledgements, not degrees, credits, qualifications or proof of competence.
Your progress
Learning needs no account. Your progress, XP and badges are stored only in your own browser and can be lost if you clear it. See Points, badges and certificates.
Last updated 2026-09-28