There is no time or space travel and, until you really get into the game, no indication of any modern technological elements.
Ultima III: Exodus returns to its medieval roots with nary a mention of planet Earth and contains a very limited amount of bizarre futuristic circumstances. With this release, it seems obvious Origin Systems realized that Ultima II: Revenge of the Enchantress strayed too far from the successful formula established in Akalabeth and Ultima I.