Einstein in 1905 [General Relativity in 1915]
How do we see motion? position
Relative motion. But the speed of light is the same.
Thought experiments
The RULES
1. The laws of nature are the same for all inertial reference frames
2. The speed of light is the same for everyone
Why can’t you go faster than light?
Do things happen at the same time? It depends.
If we are going to give up ‘common sense’, it had better fit the observations.
Particle decay
Atomic clocks
