Half a croissant, on a plate, with a sign in front of it saying '50c'
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1 G gravity on moon or mars

Use centrifuge to simulate earth's gravity
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When/if we have colonies on the mars or the moon, less gravity will cause people to have less musculature and will dramatically decrease the bone density. This can be ameliorated by having the go/workout in a centrifuge so the edge is 1 G. This way it will be possible to return to earth without being an invalid.
SolarDon, Apr 11 2021

Rendevous with Rama published in 1973 https://en.wikipedi...endezvous_with_Rama
The centrifuge is a cylinder rather than a disk. Same principle. [AusCan531, Apr 12 2021]

Wall of Death https://www.dailyma...it-low-gravity.html
Lunar exercise facility [a1, May 07 2024]

Permaspin House Permaspin_20house
[Voice, May 07 2024]

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       Put the bases at the poles ; that way there's no precessive forces to deal with.
FlyingToaster, Apr 11 2021
  

       //Put the bases at the poles//   

       For symmetry, you could put Poles at the bases too. Pozdrowienia!   

       a1 is 100% correct. A widely known concept. That's why most space stations even in the movies are of a 'hub, spoke and rim' design. Zero gee at the hub, 1G at the rim.
AusCan531, Apr 12 2021
  

       Actually, I don't remember any planetary living-quarter centrifuges appearing in SF... with the *possible* exception of a story by James P Hogan, but I can't remember what it was.
FlyingToaster, Apr 12 2021
  

       Utterly baked in SF. {-}
bs0u0155, Apr 12 2021
  

       More interesting would be non acceleration or inertial force, environment manipulated gravity designs. Most scifi just gives a future time and waves magic hands producing equipment with a switch.   

       Detailed imaginings can lead to new advancement paths.
wjt, Apr 17 2021
  

       If you ran the mechanism in reverse you could use the device to simulate freefall on the surface of the earth
pocmloc, May 07 2024
  

       What [bso0u0155] said way back in Apr 2021 //Utterly baked in SF// not to mention in many serious NASA and other design papers probably going back to the 1960s and before .. the use of a centrifuge to counter the long term effects of low gravity environments has long been half baked (in both fiction and serious science), might be considered fully baked in some ways and is very WNTI as a serious concept.   

       //in reverse//   

       ROFL nice ;)   

       [Makes notes and files next to interupted half-circle centrifuge anti gravity device]
Skewed, May 07 2024
  
      
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