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Well, I do know that one of the consequences of the Special Theory of Relativity is increase in relativistic mass. But physically, why does it happen? Do more fundamental particles get added, or do their own masses increase? (that sounds strange,I know ,but that was only to explain the kind of answer I am looking for)

Thanks in advance, and sorry if the question was stupid. My curiosity sometimes forces me to ask such foolish questions.

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