The dictionary defines a paradigm as a pattern, an example, or a model. An overall concept acepted by most people in an intellectual community, as those inone of the natural sciences, because of it's effectiveness in explaining a complex process, idea or set of data. Now that we have a little idea of why we believe what we believe, let's consider a few more paradigms. We can never travel faster than the speed of light. Travel from one solar system to another solar system can never be done in a lifetime.
Earth is the only planet with intelligent life.
If aliens visited Earth they would land on the White House lawn. Well, I think we get the picture. These are beliefs imbedded in developed minds. Minds so set that what believed must be. Black is black and white is white and nothing in between.