I know that nothing with mass can go as fast as light. I think that “there is a universal speed limit” and that :light achieves that limit” are two different statements. So, I am curious about the first one. Is it just an axiom?
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The universal speed limit is a consequence of Mass and Energy being the same thing (from the famous E=MC2 equation).
So to get something to move faster you have to give it energy, the more mass it has the more energy you need to give it to achieve the same speed. That’s pretty intuative, it takes more energy to speed up a car than a baseball.
But giving something energy means it has more mass equivalence so speeding up something that is already going fast takes more energy then speeding up something that is going slow.
Because of this speeding something up to the speed of light takes infinite energy because of calculus.
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