Set of smaller nested dolls and solar panel: what they have in common

1. Step 1. Set of smaller nested dolls — is part of — Matryoshka. Smaller dolls.
2. Step 2. Matryoshka — uses — Lathe. Turned on a lathe.
3. Step 3. Lathe — uses — High-speed steel. Cutting tools.
4. Step 4. High-speed steel — is made of — Tungsten. Tungsten.
5. Step 5. Tungsten — is material for — Ion thruster. The cathodes are tungsten.
6. Step 6. Ion thruster — has part — Solar panel. Power supply.

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