I fear my answer might lead the question towards being a duplicate, but I can't find the original question I'm thinking of right now.
Technology in the Star Wars Universe is degrading generation after generation
Which is in of itself creating more and more limitations as the years go by. If you compare the technology of the Rakatan's Infinite Empire compared to what the Republic fights against at the end of Episode VI and even in the Expanded Universe ... they barely compare. The Death Star is considered a superweapon by the time of the New Republic, but it's really nothing compared to the Mass Shadow Generator or the Star Forge. Most of the truly powerful items in Star Wars are old if not ancient.
The relevancy here is that things which seem impossible in the Star Wars Universe currently is probably possible through some kind of ancient artifact or being. For instance, the now oft quoted lack of time travel was actually achieved in Star Wars via Splendid Ap who sent Leia Organa 8,000 years into the past. Splendid is a near omnipotent ancient being. Teleportation is possible, but only via Rakatan technology.
Counter to this, specifically when it comes to time travel, is Jacen Solo's use of flow walking - a form of time travel, but still modern ... just rare among Jedi.
So I would answer no - if it seems technologically impossible in Star Wars, it can be done either through a) ancient technology or artifact, b) some omnipotent being or c) The Force.