Here's why:
* Laws describe how things behave, often mathematically. For example, Newton's Law of Universal Gravitation describes how objects attract each other.
* Theories are well-substantiated explanations of some aspect of the natural world. They are supported by a large body of evidence and can be modified or replaced as new evidence emerges. For example, the Theory of Relativity explains gravity in a different way than Newton's Law.
The speed of light is not a description of how something behaves; it's a fixed value, the speed at which light travels in a vacuum. It's a fundamental constant of our universe, like Planck's constant or the gravitational constant. These constants are not explained by any theory; they are simply observed to be true.
In summary: The speed of light is a physical constant, not a law or a theory. It is a fundamental property of the universe, observed to be true and used in many physical laws and theories.
