Eli5: Why does light travel so fast?
In: 130
Why question are difficult to answer while how question (descriptions) are relatively easy in comparation.
One explanation is that that speed is the speed of causality. A massless particle can’t disappear before being created. Depending on your reference frame it can have a different “travel” in spacetime but still you always see it the same speed, the speed of causality. No consequence can happen faster in space-time than its cause.
Although this is a more general principle that’s not really saying much about why.., why does causality had that speed value? We don’t know.
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