Microwave cavity and greenhouse: what they have in common

1. Step 1. Microwave cavity — is part of — Atomic clock. It excites the 9.19 GHz transition.
2. Step 2. Atomic clock — is used in — GLONASS. Atomic clocks.
3. Step 3. GLONASS — has part — Artificial satellite. Satellites.
4. Step 4. Artificial satellite — has part — Solar panel. Powering satellites.
5. Step 5. Solar panel — has part — Window glass. Tempered cover glass.
6. Step 6. Window glass — is part of — Greenhouse. It lets light in and holds heat.

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