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First, there is no "...amount of energy it takes to travel at light speed." That is the issue. The amount of energy required to approach the speed of light increases asymptotically, reaching infinity at the speed of light itself. This is the issue. There is no conventional way to accelerate mass to the speed of light threshold. That said, ...


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The strongest argument against FTL travel-- or communication-- is that it would allow causality violations just as traveling backwards in time would. Given FTL travel and different relativistic frames of reference, you could change things in the past. And no, it doesn't mean things would just appear to go back in time; you would have frames of reference in ...


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It’s not people who say we cannot travel at or faster than the speed of light, it’s the theoretical models that say so. Those models, in particular, general relativity, are the best theories available so far to explain everything we can observe and nothing we observe is in contradiction to those theories. In the frame of those models we must come to the ...


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