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Alright, i have a final and i have to explain just three parts to einstein's theory of relativity... they are space travel (time slowing nearing the speed of light), increase of mass with speed, and length contraction... the space travel makes no sense, and the mass one, i have mixed feelings about... i know that mass is the amount of matter something has, but as somethign speeds up, it gets more matter? it doesn't make sense... and the length contraction seems backwards too... normally when you see a car fly by really fast, it looks a little longer... man if i were einstein, then i would know, but seeing as how i am just in high school, it doesn't make to much sense... please help