Roller chain and solar panel: what they have in common

1. Step 1. Roller chain — is part of — Electric bicycle. The chain drive from the pedals remains.
2. Step 2. Electric bicycle — has part — Hub motor. A hub motor or a mid-drive motor.
3. Step 3. Hub motor — is part of — Mars rover. Hub motors.
4. Step 4. Mars rover — evolved from — Lunokhod. Planetary rovers.
5. Step 5. Lunokhod — has part — Solar panel. A solar panel.

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