Spacesuit and fuel cell: what they have in common

1. Step 1. Spacesuit — is used in — Vostok 1. The SK-1 spacesuit.
2. Step 2. Vostok 1 — has part — Heat shield. A spherical descent capsule with a heat shield.
3. Step 3. Heat shield — is part of — Space Shuttle. Heat-shield tiles.
4. Step 4. Space Shuttle — has part — Liquid-propellant rocket engine. Hydrogen-fuelled main engines.
5. Step 5. Liquid-propellant rocket engine — uses — Hydrogen. Hydrogen is an efficient fuel.
6. Step 6. Hydrogen — is used in — Fuel cell. The fuel is hydrogen.

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