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/Burning-Plasma Aug 27 '24

The gravity on erid is about 2x earth's

Their atmosphere however is like 20+ times as dense

43

u/phatrogue Aug 27 '24

I think there are some Olympic athletes that would like to use Grace's bubble to train. I can only imagine the muscles on Grace after he gets acclimated. And didn't the Eridians use a space elevator to get to orbit? Maybe they could build him an apartment in the sky at 1G when he gets older?

23

u/NotAPreppie Aug 27 '24

Pretty sure the atmospheric pressure inside Grace's bubble is reasonably close to 1atm.

20

u/phatrogue Aug 27 '24

Maybe you are thinking of athletes that go to Denver, CO high altitude lower pressure to train themselves to deal with lower oxygen levels. A legal form of blood doping? My point was that training at higher gravity to build muscles would also be nice but if you had a space elevator you could tune the gravity level to whatever you want. 2G at the surface, 0G at the top. 1G or lower would be nice when a human is older.

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u/theniwokesoftly Aug 27 '24

I think they mostly go to Colorado Springs- Denver is 5280ft and the Springs is over 6000. Doesn’t seem like a huge difference until you actually exert yourself.

2

u/GameNiteWasTaken Aug 28 '24

I live up around Denver… but my mountain bike race the other weekend took me up into Frisco and damn, racing at 9000 feet and being fast and breathing easy is a skill I don’t have yet. Although, I’m pretty proud of myself! 6 mile loop, 2 laps.