Special relativity |
|
The measured velocity of light in vacuum is independent of the relative velocity of the source and observer. The observation leads to the inescapable conclusion that measured distance and time are related to the velocity of the observer and are not independent as one would suppose.  The first consequences of importance are length contraction in the direction of velocity and time dilation (moving clocks run slower). |
| That is what you get - you are not expected to believe it or to understand it at any deeper level. It will be some time before the results become part of our everyday understanding of the world. |