User Monomyth posed an interesting question on the Traveller discord that I wanted to replicate here:

hi team, just a quick discussion based question with no right answer; if youre running a game, and the players decide to veer off course into something completely out of left field (such as going to a planet you do not have prepped), is it appropriate to come up with some “delaying issue” so you can have it ready for next session?

Transposing to other settings: what do you do when the players go off-script?

I can summarize some answers we’ve got on that server, but I don’t want to prime your answers from the start.