Rocket tube and glasses: what they have in common

1. Step 1. Rocket tube — is part of — Rocket. The tube in which the charge burns.
2. Step 2. Rocket — evolved into — Guided missile. A rocket with guidance.
3. Step 3. Guided missile — has part — Gyroscope. An inertial system.
4. Step 4. Gyroscope — is part of — Space telescope. Pointing gyroscopes.
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.
6. Step 6. Telescope — evolved from — Glasses. The first telescopes were assembled by spectacle makers.

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