 TPol tells the amnesiac Archer that they are "...on the fifth  planet of the Ceti Alpha system." This is the same planet on which  Captain Kirk left Khan Noonien Singh in "Star Trek" (1966) episode  #., "Space Seed". At that point, Ceti Alpha V is described as harsh  and inhospitable but survivable. Despite the fact that the landscape  seen through the windows in "Twilight" seems to be not only  congenial but even pleasant, as opposed to merely survivable, this  is consistent with what is learned of the Ceti Alpha system in Star  Trek: The Wrath of Khan (1982). In the film, Khan states that Ceti  Alpha V was turned into a wasteland by the explosion of Ceti Alpha  VI, which altered the orbit of Ceti Alpha V. Planets dont typically  explode for no reason 