1. The time distortion due to relative velocity does not cause any "real" loss if time in itself,loss of time only happens with acceleration, right? How can I predict the amount of time that has been lost relative to an inertial point of view(if I know the value for the other variables)? 2. Is the gravitational field created by an object relative? ie: does the m in the formula vary with 1/(1-sqrt(v^2/c^2))? 3. c is the limit of the velocity an object can have. Is there a limit to the acceleration an object can have (I am speaking only of instantaneous acceleration here)?