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Originally Posted by RespectThat
why does it gain mass and where does this mass come from?
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As far as I can understand the reasoning behind the whole gaining mass the closer to speed of light thing is: As the object approaches the speed of light it gains an incredible amount of kinetic energy. Now all of that energy can't just sit there and do nothing, it's energy it's got to do something, so lacking anything else to do it becomes mass.
Which is why it is theorized that you can't go faster than the speed of light, because as you approach it(theoretically) your mass approaches infinity and the energy it takes to accelarate that increasing mass approaches infinity also.