why the LHC can’t go the speed of light

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The Large Hadron Collider can accelerate protons to 99.9999991% the speed of light. Why can’t we reach 100%?

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Follow-up question based on the replies:

I remember reading some stuff from some theoretical physicists (think Stephen Hawking was one of them) theorising that time travel would be possible if you could go faster than the speed of light, since time is relative and time would go slower for you then everything around it.

Isn’t this theory completely pointless if it defies all physics for anything with a mass to be able to even travel AT the speed of light, never mind FASTER than the speed of light?

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