These distances are out of reach? Perhaps not! The idea of traversing such a distance must incorporate the concept in physics known as black hole theorem. The pioneer of such an endeavor of travel would have no way of doing trial runs or experimenting because there would be no guarantee of a return trip to the exact time and place of departure. That is however also a theory.
The concepts of creating black holes has become a reality but only micro holes in size and the length of time that the holes would exist is also in the micro seconds. To better expand the size and the duration of the black hole we must use what we know and theorize what we do not.
We know to construct a black hole requires energy (e) needs that are in the mega joule range but if we were able to capture and refine the stream of (e) to direct points in (t) then that would enable the >(c) ability and thus (d) would be inconsequential. How?
Gravity (g) is a force of nature. It is the most powerful force of nature and if we can harness and understand then we can use it to our advantage in controlling (t), (d) and (v)!
From the earliest 20th. century science has been able to split the atoms. But what instead of split the atom we were to separate the atoms like a zipper of a jacket? What if we were able to separate the atoms like a hand that is immersed in water that separates the molecules of water. Now imagine in your minds eye a "large zipper" in the air that you were able to "unzip" and step through. Here is the bridge of (d) and (t) that would enable us to traverse the great (d) of the universe.
So now we come to the idea of how to construct this bridge or zipper in the universe. The poles of atoms are like the poles of the planet north (n) and south (s). If we were to place a gravity field counterpart to each other and then rotate the gravity field in a direction that would allow the atoms to be attracted to their natural poles in the gravity field then at that moment direct a flow of energy in the precise enter of the field where theoretically there would be no gravity thus no gravity of attraction no atoms.
The gravity field we know can be constructed by the use of a magnetic field opposite to and aligned attracting the atoms away from the center creating a "void" the idea of the direct beam of energy can be derived from a high (e) laser that would "unzip" the 3D universe we are in and open a doorway to ? We do not know! But then sailors of ancient times sailed beyond the horizon to what for them was a new and different universe.
Who ever would undertake this journey and step through the doorway would be undertaking such a venture with the knowledge they may never return or possibly not return to where they originated. The initial journey would have be done with the mind set that logic and theory would be the only "life"raft they would have to cling to.