District heating and LIGO: what they have in common

1. Step 1. District heating — uses — Centrifugal pump. Network pumps.
2. Step 2. Centrifugal pump — is part of — Liquid-propellant rocket engine. Turbopumps deliver the propellant.
3. Step 3. Liquid-propellant rocket engine — is part of — Space Shuttle. Hydrogen-fuelled main engines.
4. Step 4. Space Shuttle — is made of — Silica (sand). The heat-shield tiles are silica fibre.
5. Step 5. Silica (sand) — is material for — LIGO. The mirrors are fused silica.

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