"Well, it's not a simple undertaking. But yes." She gives him a crooked smile, a bit sheepish for not having shared this information yet. "You see, the Thern created -- or more likely, I suspect -- made use of an ancient network of geographical nodes. Coordinates spread all over the planet, and on Earth as well. If you know the coordinates to a place, you can utter a series of syllables and it will transport you there. Though interplanetary travel seems to send a projection -- or a copy, if you will. I haven't a complete grasp of how the whole system works, but I know enough to use it for travel between certain points on Barsoom."