The highly elliptical handoff lane that rockets use to deliver satellites to geostationary altitude, a narrow sliver of orbital space where every communications satellite you've ever seen spends its first few weeks of life.
Five spots in the Earth-Sun system where the gravitational tug of two massive bodies and the pull of circular motion all cancel out, creating gravitational parking spaces where spacecraft can sit for decades with almost no fuel.
The cheapest way to get from one orbit to another, invented on paper in 1925 by a man who never built a rocket.
The final resting place for retired satellites — a disposal orbit where defunct spacecraft are sent to stay out of the way
What happens when space objects come home — the fiery physics of returning from orbit and why predicting where debris lands is so difficult
The master ledger of everything orbiting Earth — how tens of thousands of satellites, rocket bodies, and debris fragments are tracked and numbered
