Wave interference and r-7 rocket: what they have in common

1. Step 1. Wave interference — is used in — Interferometer. Interference.
2. Step 2. Interferometer — inspired — Theory of relativity. The Michelson–Morley experiment found no ether.
3. Step 3. Theory of relativity — is used in — GPS (satellite navigation). Corrections for the relativistic slowing of clocks.
4. Step 4. GPS (satellite navigation) — is part of — Reusable rocket. Navigation during landing.
5. Step 5. Reusable rocket — has part — Liquid-propellant rocket engine. Liquid-propellant engines.
6. Step 6. Liquid-propellant rocket engine — is part of — R-7 rocket. RD-107 and RD-108 engines.

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