eli5 how do we know nothing is faster than light?
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From what i understand the dumbed down version, when any “thing” with mass moves, it becomes heavier. So anything with mass will just get insanely heavy the closer it gets to high speeds. Essentially it gets so heavy as it approaches the speed of light, it can never truly reach the speed of light. Light photons on the other hand dont have any mass as they are photons.
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