I have heard many claims about the effects of space-time distortion but not really anything specific as far as matter. For example: I place two spheres 5 meters apart on the z-axis into empty space-time that is not at all distorted. Then I proceed to evenly stretch all of the space-time in that area by a factor of two along the z-axis. Is the result still two spheres that are 5 meters apart or two ellipsoids that are 10 meters apart? I ask this to help me understand how warp-drive could possibly function, and what effects it would have on the space that was warped. I hope this isn't a stupid question.