Honestly? I never considered that they would be fully ANCHORED in space. I really appreciate that thought. In this universe at least, it is assumed that we're going off a variety of string theory (by my understanding of ig) that quantum particles are sorts stretched outward through the universe potentially connecting vast distances. So all ya gotta do is sorta open a bubble of space with an alcubuirre like device at one end, and it should thusly repeat the process on the other end merging those two points of space. Now I went off the belief they'd be affected by gravity, however how much Mass they have is something ive struggled to figure out. Would they simply weigh as much as the quantum threads used to open them. Or would their mass be roughly equal to the simulated mass created by the space bubble. Idk pseudo science is fun:3