Sandpaper and solar panel: what they have in common

1. Step 1. Sandpaper — is made of — Paper. The backing.
2. Step 2. Paper — is material for — Rocket. The first rockets were paper tubes filled with gunpowder.
3. Step 3. Rocket — uses — Reaction force. A rocket moves by reaction force.
4. Step 4. Reaction force — is used in — Ion thruster. Jet thrust.
5. Step 5. Ion thruster — has part — Solar panel. Power supply.

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