Eli5: Why does light travel so fast?
In: 130
Some follow up points:
We don’t know the speed of light, we know the speed of the roundtrip of light when measured. Light could go faster in one direction hit and object and return to us slower and we won’t be able to tell the difference from an scenario were speed of light is constant in all directions.
Light travels in space, and space is not bound to the same rules as light. For instance, space can move faster than the speed of light. In the universe there is light that will never reach us because patches of space that contains light is moving faster away from us than light is moving towards us.
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