Halogen lamp and liquid-propellant rocket engine: what they have in common

1. Step 1. Halogen lamp — is made of — Tungsten. Tungsten.
2. Step 2. Tungsten — is material for — Ion thruster. The cathodes are tungsten.
3. Step 3. Ion thruster — is part of — Space probe. Ion thrusters (Dawn).
4. Step 4. Space probe — uses — Multistage rocket. Launch.
5. Step 5. Multistage rocket — has part — Liquid-propellant rocket engine. Engines on every stage.

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