Half a croissant, on a plate, with a sign in front of it saying '50c'
h a l f b a k e r y
This would work fine, except in terms of success.

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Lunar Poop Catapult

Solid waste processing for the Moon colony
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While sitting on the throne reading the Daily Lunacy a moon citizen makes poop.

The poop goes to an accumulator, and when the accumulation reaches a specific mass it is compacted. The attached catapult (to be designed by [8th]) launches the desiccated, compacted brown mass into lunar orbit, to whiz around and around with all its previously-launched fellow poop blobs in much the same manner as Terran space trash. Upon random re-entry the poop will be distributed much like farm manure.
whatrock, Jun 26 2020

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       [-] Read Andy Weir's "The Martian" (2011) or Robert Heinlein's "The Moon Is A Harsh Mistress" (1966) to get a sense of how important that shit is for survival away from Earth. It's too valuable to just fling it randomly around.   

       -Edit to add: I'm not sure what you mean by "random re-rentry." If you're pitching it towards Earth, it's gonna burn up in the atmosphere. If you're putting it in lunar orbit, it's not gonna "re-enter" anything - no atmosphere to re-enter or to cause the orbit to decay. If it eventually spirals in anyhow, it's just gonna crash back on the lunar surface and likely vaporize on impact.
kdf, Jun 26 2020
  

       He's envisioning it orbiting the moon in a degrading orbit that eventually see's it hit the surface, presumably as part of some long term moon terraforming project.   

       I think it's more likely to have its orbit perturbed by the earth each pass until it eventually breaks orbit & slingshots off into the great black yonder or gets captured by the earth's gravity & achieves reentry to the wrong object though.   

       But I'm no physicist & can't be bothered to work out the orbital mechanics.   

       Admittedly that's mostly because I wouldn't know how to.
Skewed, Jun 26 2020
  
      
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