07 Understanding the principle of invariant light speed
In an inertial system, the speed of light is always constant. It is a very short sentence, but today this proposition is not fully understood. If you thoroughly understand and adhere to two principles of relativity theory, the principle of relativity and the constancy of the speed of light , you can naturally conclude against a reasonable relativistic length. If we keep these two principles constant, without preliminarily setting a conclusion about length, we can make a surprising discovery. Especially about length. The two principles of special relativity theory speak about symmetry and conservation. The first principle, the principle of relativity, says that all inertial systems are symmetrical to each other, and the second principle, the constancy of speed of light, says that the light speed is always preserved. At first glance, these two principles seem to oppose each other. However, if these two principles work in harmony, you get amazing conclusions. After...