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Is there a simple way to prove to someone that light travels at c in a vacuum? I was having a debate with a friend and he said the speed of light isn't real.
Basically I told him about an article I read about a new technology that could get us to Mars in a few days, I told him it would probably be near the speed of light (just a guess) and then he said the speed of light isn't real, whatever that means.
It's more about me learning what to say next time such a conversation comes up. Nothing I hate more than accepting scientific theories and not knowing how to justify my opinion when someone says otherwise.