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Most people think the speed of light requires giant labs or satellites to measure. But it starts before space missions, when a simple Fizeau toothed-wheel experiment sets the test. That wheel spins so fast each gap chops the beam, sending pulses to a distant mirror. As wheel speed rises, flashes and reflections clash, and the returning light fades at a specific rotation. Today lasers shoot from Earth to the Apollo 11 lunar retroreflector, bouncing back from its mirrored corners as pinpoint flashes. Each round-trip pulse refines the measurement, showing backyard setups can approach the universal speed limit. Follow for one real science fact every day.

Topic: Speed of Light From Your Backyard

Created: 2026-03-16 09:22:44

Confidence: 92%

YouTube: ✅ Uploaded - View Video

Uploaded at: 2026-03-16T05:00:06.394277

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