Jake asked Andy Weir:

Hey Andy, great book. How much of the science did you have to figure out before the novel really started coming together? What was that process like? Were you researching and revising previous material with new info?

Andy Weir Just tons and tons of online research. I didn't need to revise that much.

When I originally wrote the book, it was a serial I posted to my website one chapter at a time. And I have a lot of scientifically-minded readers. So they would email me when I had a mistake. It was a great "beta reader" process. :)
Andy Weir

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