Lessons Learn orbital mechanics step by step, from basic ellipses to three-body chaos. Kepler ~8 min Kepler's First Law Discover why orbits are ellipses, not circles.Kepler ~10 min Kepler's Second Law Equal areas in equal times — why planets speed up and slow down.Kepler ~8 min Kepler's Third Law The relationship between orbital size and period.Newton ~12 min Newton's Gravitation The force that holds it all together.Orbits ~8 min Circular Orbits The simplest orbit — and the velocity to maintain it.Orbits ~10 min Escape Velocity How fast do you need to go to leave?Transfers ~15 min Hohmann Transfer The most fuel-efficient way to change orbits.Transfers ~12 min Gravity Assists Stealing speed from planets.Advanced ~15 min Lagrange Points Where gravity balances out.Advanced ~12 min Three-Body Problem When orbits become chaos.