Nuclear fission and optical telegraph: what they have in common

1. Step 1. Nuclear fission — uses — E = mc². The energy is the mass defect.
2. Step 2. E = mc² — is a kind of — Theory of relativity. A consequence of special relativity.
3. Step 3. Theory of relativity — uses — Speed of light. The constancy of the speed of light.
4. Step 4. Speed of light — uses — Telescope. Observations of Jupiter’s moons.
5. Step 5. Telescope — is used in — Optical telegraph. Signals were read through a telescope.

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