Lunar module e mechanical clock: o que têm em comum

1. Passo 1. Lunar module — tem como parte — Liquid-propellant rocket engine. A descent engine.
2. Passo 2. Liquid-propellant rocket engine — faz parte de — Space Shuttle. Hydrogen-fuelled main engines.
3. Passo 3. Space Shuttle — é feito de — Silica (sand). The heat-shield tiles are silica fibre.
4. Passo 4. Silica (sand) — é material para — Quartz clock. The resonator is a quartz crystal.
5. Passo 5. Quartz clock — evoluiu de — Mechanical clock. Quartz clocks replaced mechanical ones: a vibrating quartz crystal took the place of the pendulum and balance.

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