Almost everything in physics is based on the speed of light, as a fundamental constant, on the fact that it is the same in all directions. However, in reality, this is not known, it is an assumption (which seems impossible to either confirm or refute). This assumption might imply that the stars we see in the sky (which, upon beautiful reflection, may actually no longer exist) could be burning right at this moment.
It is useful to reassess that although it’s relatively simple to know the rules, it is much more difficult and “expensive” to understand the exceptions, priorities, and boundaries of the applicability of these rules.
Here is a link to the translation into Russian, the original is here: https://www.youtube.com/watch?v=pTn6Ewhb27k
Hi, I'm Rauf Aliev. 