Planetarium and parachute: what they have in common

1. Step 1. Planetarium — is made of — Concrete. Zeiss’s first dome was thin concrete.
2. Step 2. Concrete — is material for — Launch complex. The launch table is concrete.
3. Step 3. Launch complex — is used in — R-7 rocket. Baikonur.
4. Step 4. R-7 rocket — evolved into — Soyuz. The Soyuz rocket belongs to the R-7 family.
5. Step 5. Soyuz — has part — Parachute. Landing by parachute.

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