Zach asked Andy Weir:

This question contains spoilers… (view spoiler)

Andy Weir I did tons of research and math. All the information is out there. It was just a matter of finding it and putting it together correctly.

I didn't cover what they do when they get home because the story was over. It's better to leave your reader daydreaming about what happens next than getting sick of the epilogue.
Andy Weir

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