Are you familiar with the concept of wormholes and warp space? Speaking scientific fact here not matter how crazy it sounds so bear with me... Space and time are both tangible objects that can be manipulated like everything else around us. Leaving 10 pages of the "how to's" out of this post I'll just say that it is possible to alter the fabric of space to shorten the distance of planets as well as altering time itself while moving between points. While it may not be possible for us today with our current technology, when you apply the lore of the traveler and the advancements of the golden age it's not hard to imagine humans in the destiny universe have a way travel to mars in a few minutes