Rocket propellant tank and electric motor: what they have in common

1. Step 1. Rocket propellant tank — is part of — Multistage rocket. It stores fuel and oxidizer.
2. Step 2. Multistage rocket — is used in — Space probe. Launch.
3. Step 3. Space probe — has part — Radioisotope generator. The Voyagers’ RTGs.
4. Step 4. Radioisotope generator — is part of — Mars rover. Curiosity’s RTG.
5. Step 5. Mars rover — evolved from — Lunokhod. Planetary rovers.
6. Step 6. Lunokhod — has part — Electric motor. Hub motors.

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