Passive cooling system and telescope: what they have in common

1. Step 1. Passive cooling system — is part of — Small modular reactor. Removing heat without pumps or power.
2. Step 2. Small modular reactor — has part — Control rod. Control rods.
3. Step 3. Control rod — is made of — Silver. Control rods of pressurized water reactors are a silver–indium–cadmium alloy.
4. Step 4. Silver — is material for — Mirror. A silver coating.
5. Step 5. Mirror — is part of — Reflecting telescope. The primary mirror.
6. Step 6. Reflecting telescope — is a kind of — Telescope. A telescope.

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