# Interpretation of Special Relativity

When we looked at Quantum Mechanics, we talked about its various interpretations. The reason we have such interpretations, I said, is that QM deals with a reality that we have no access to, through our sensory and perceptual apparatuses. Por otra parte, Special Relativity is about macro objects in motion, and we have no problem imagining such things. So why would we need to have an interpretation? The answer is a subtle one.
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# Speed of Light

The speed of light being a constant sounds like a simple statement. But there is more to it, quite a bit more. Let’s look at what this constancy really means. A primera vista, it says that if you are standing somewhere, and there is a ray of light going from your right to left, it has a speed c. And another ray of light going from left to right also has a speed c. So far, so good. Now let’s say you are in a rocket ship, como se muestra en la siguiente figura, moving from right to left.

# Teoría especial de la relatividad

Cuando oímos hablar de Einstein y la relatividad especial (o la teoría especial de la relatividad, utilizar el nombre real), pensamos en la famosa $E = mc^2$ ecuación, y las cosas extrañas como la paradoja de los gemelos. Mientras que esas cosas son ciertas e importantes, el problema SR trata de resolver es un ser completamente diferente. Es un intento de defender un principio básico de la física.
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