Phosphor coating and r-7 rocket: what they have in common

1. Step 1. Phosphor coating — is part of — Fluorescent lamp. A coating that glows under UV.
2. Step 2. Fluorescent lamp — uses — Plasma. A discharge in mercury vapour.
3. Step 3. Plasma — is used in — Ion thruster. An ionized gas.
4. Step 4. Ion thruster — is part of — Space probe. Ion thrusters (Dawn).
5. Step 5. Space probe — uses — Multistage rocket. Launch.
6. Step 6. Multistage rocket — includes — R-7 rocket. A clustered multistage layout.

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