Green baize playing surface and telescope: what they have in common

1. Step 1. Green baize playing surface — is part of — Billiards. A slate slab covered with baize.
2. Step 2. Billiards — uses — Newton’s laws. Collisions of balls.
3. Step 3. Newton’s laws — includes — Universal gravitation. Part of Newtonian mechanics.
4. Step 4. Universal gravitation — evolved from — Kepler’s laws. Newton derived gravitation from Kepler’s laws.
5. Step 5. Kepler’s laws — evolved from — Heliocentric system. A refinement of Copernicus.
6. Step 6. Heliocentric system — uses — Telescope. Galileo’s confirmations.

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