The speed of light c is NOT a universal constant | Sociology and Pure Physics | N J Wildberger

Einstein’s Second Postulate for Special Relativity asserts that the “speed of light“ c is the same in any inertial reference frame. Unfortunately, this is not a correct statement about the world. To understand why, we will have to go back in time to the real beginning of Relativity, with the remarkable insight of Galileo Galilei in 1638 and its dramatic implications about the nature of space and time. We’ll discuss the Michelson Morley experiment, and what it does and does not actually demonstrate. Various widely held beliefs or assertions in the physics community will be examined ... somewhat more critically than usual. And we’ll see that there really is a difference between us and those Klingons when it comes to “measuring the speed of light“.