Why Do Spaceships Shorten When They Fly at the Speed of Light?

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we all know that when a spaceship is flying it is getting shorter, in proportion to the speed of light. i don't know why it is happen but i build a theory. since the mass of the spaceship increases also, the spaceship it self spread more gravitones who warp the space of the spaceship - warping as shortening.
true?
 
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No, special relativistic effects have nothing to do with gravitons.
 
so why the spaceship get shortend, in proportion to the speed?
 

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