Spacecraft
级
Stage
A self-contained propulsion section, dropped when spent.
More stages usually mean more capacity but more complexity.
Related terms
- Cryogenic propellant — Propellants kept very cold, such as liquid hydrogen and oxygen.
- Methalox — Liquid oxygen with liquid methane.
- Solid rocket motor — A motor whose fuel and oxidiser are solid.
- Hypergolic propellant — Two fluids that ignite on contact.