Space debris and refrigerator: what they have in common

1. Step 1. Space debris — uses — Orbital motion. They remain in orbit.
2. Step 2. Orbital motion — is used in — Space station. In low Earth orbit.
3. Step 3. Space station — has part — Solar panel. Power comes from solar panels.
4. Step 4. Solar panel — is used in — Energy-efficient house. Solar energy.
5. Step 5. Energy-efficient house — uses — Heat pump. Heating.
6. Step 6. Heat pump — works like — Refrigerator. A heat pump is a refrigerator that heats the house.

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