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Introduction
How to measure the speed of a baseball
How Fizeau measured the speed of light
What if the speed of light is different in different directions?
Synchronization Problem
Why GPS Won't Work
What happens if someone on Earth immediately responds?
Spacetime Diagram
What is the one-way speed of light?
Conclusion
Introduction
1/3 Detect motion with particles? (Thought experiment)
Inertia doesn't allow detecting constant velocity motion
2/3 Detect motion with waves? (Thought experiment)
Medium doesn't allow detecting constant velocity motion
Constant velocity motion is RELATIVE!
3/3 Detect motion with light? (Thought experiment)
Does light break relativity?
Michelson & Morley's experiment (oversimplified)
The logical conclusion - Speed of light is same in all frames
Discovering time dilation & length contraction
Summary