Greg Lafave
Greg Lafave asked Andy Weir:

Thanks for bringing my family(all of us engineers) together on a great read. We feel you had a deadline or something to reach as the pacing seem to change in the last 2 chapters in the book which is what this all built up to. What were the reasons for ending it the way you did? Did they even make it back to earth? Alot could still go wrong. Any insights?

Andy Weir
This answer contains spoilers… (view spoiler)
Andy Weir

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