Triode and telescope: what they have in common

1. Step 1. Triode — is made of — Tungsten. The filament is tungsten.
2. Step 2. Tungsten — is material for — Ion thruster. The cathodes are tungsten.
3. Step 3. Ion thruster — has part — Solar panel. Power supply.
4. Step 4. Solar panel — is part of — Space telescope. Solar panels.
5. Step 5. Space telescope — is a kind of — Telescope. A space telescope is a telescope above the atmosphere, so air does not blur the view.

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