Traveling through physical space from one solar system or galaxy to the next seems almost dumb, tbh. Wormholes, higher(lower?) dimensions, time travel, as digital information, nanotechnology, heaven, outer realms or some combination; all seem like better prospects, imo. Near/lightspeed/ftl travel all seem to have huge issues from energy requirements or gravitational issues to making contact with a piece of dust.
Harder to overcome in my mental midget brain is that computers running navigation and plans for course corrections would need processing capabilities that don't require electrons and are faster/significantly faster than the speed of which the ship is sailing. I don't think that parallel processing or predictive branching is going to help. The response/delay of any system whether physical or forcefield or whatev would also need to be capable of those speeds or else you crash into a rock at time travel speeds before you even know it's there. I would guess that kind of destructive energy would be visible from very far ...and also destructive to local systems.
If there are UFOs visiting us from other solar systems, I would guess those are just the vessels being used to get around locally(Earth/solar system/home planet/system). I don't think they traveled through interstellar space to get here. Although, since the Universe is moving and speeding up, there may possibly be a way to leave a "package" behind for the future arrival of another solar system. Though, I feel like that would probably require solving a lot of unresolved issues with mathematics. Time travel requires space travel (1.3 million miles of space travel per one hour of earth to earth time travel), and space travel requires time travel (near/lightspeed+).
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