Thanks for the information (fascinating!). A gravitational fly-by of Sirius B would be crazy. Straight-shot trajectory (and/or gravitational assist) would be t

Thanks for the information (fascinating!). A gravitational fly-by of Sirius B would be crazy. Straight-shot trajectory (and/or gravitational assist) would be the simplest way to get the ship there, but other constraints might force one to "stop and refuel": * Energy needed to maintain life for duration of journey (e.g. hibernation) may exceed what you can store in one "charge" for your ship. * Instead of 3D trajectory travel, perhaps the energy needed to "warp" or establish a worm-hole is proportional to the distance being travelled. * Or, perhaps, the reliability and precision of calculated trajectories breaks down after certain distances; forcing a series of "hops" vs. a single trajectory in order to make the journey safe/reliable. * Time may factor in. You may have enough energy, but perhaps components of the ship can't be expected to operate without error/failure for such long times. In that case, "stopping to refuel" might include expected repairs as well. All hand-wavy a bit, but interesting to think about.