Landing gear and aerosol can: what they have in common

1. Step 1. Landing gear — is part of — Lunar module. Legs.
2. Step 2. Lunar module — has part — Liquid-propellant rocket engine. A descent engine.
3. Step 3. Liquid-propellant rocket engine — has part — Centrifugal pump. Turbopumps deliver the propellant.
4. Step 4. Centrifugal pump — is part of — Central heating. A circulation pump.
5. Step 5. Central heating — has part — Valve. Valves on the radiators set how much hot water flows into a room.
6. Step 6. Valve — is part of — Aerosol can. A valve.

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