I have this book called "the physics of star trek" thats explaining that matter bends spacetime says that if someone were to move forward in their ship and create a inertial force equal too gravity on earth, that person would not be able too tell the diference from the inertial force and earth on gravity. A couple weeks after reading that a thought popped into my head, what if there is no difference between that inertial force and the gravity on earth? What if by accelerating that fast you are creating a gravitional force? That would mean that instead of your MASS increasing the closer you get too the speed of light, your "inertial" gravity would increase. So, what do you guys think?