“…Physical possibility is only one such candidate (e.g., Klimov's Come and See is physically possible whilst Lucas's Star Wars is not); moreover, in the context of science fiction, it is unlikely to be of much interest. Certainly, when it comes to time travel, broader modalities are normally our focus, e.g., logical possibility [1,5,[12][13][14][15][16][17], metaphysical possibility [3,[18][19][20][21][22][23], conceptual possibility [24], or absolute possibility [25,26].…”