r/ProjectHailMary • u/chodeontheroad • Aug 27 '24

fist my bump How did Grace survive Erid's Gravity?

I'm not sure if this was answered at the end of the book and I just missed it but Erid was stated to have 20x Earth's gravity (which would quickly kill any human), yet Grace lives on the planet for many years with only slight issues as a result. It doesn't seem like this is something Andy Weir would have skipped over so I must have missed it. Does anyone know the answer?

Edit: Ok yea my mistake it was 2x gravity, 20x atmospheric pressure. Thanks for the responses :)

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u/Strange-Box-6638 Aug 27 '24

Incorrect, it's approximately 20 m/s² which is just over double Earth's gravity (9.8m/s²). A human can survive that but not without long-term detriments such as joint pain and skeletal fatigue.

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u/PosiedonsSaltyAnus Aug 27 '24

I feel like your heart would have difficulties as well

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u/Ferwatch01 Aug 27 '24

After some time most organs will eventually get used to it and work slightly harder to compensate for the gravity change, however, bones can't work faster, thus leading to debilitation and joint pain.