alt Hacker NewsThis story of space toilers clears out many questions I had about spaceflight and... uh, going number 2.
Namely: astronauts try NOT to as much as they can, and when they do go, it's a mess for both them and their crew mates. They suffer through it because being in space is a worthy achievement.
Apparently it's such a mess that NASA estimates this is why astronauts tend to undereat. Apparently Gemini 7's Frank Borman spent 9 days without going number 2 because of this, and planned to hold it in 2 full weeks (the article doesn't clarify whether he managed). Skylab seems to have done some progress, but we're still in the early eras of space toiletry!
On Apollo 13, after the accident, the margins for propellent were so low that the astronauts had to drink very little. Nasa was afraid that venting the pee would set their trajectory off course.
One of the astronauts got an infection from dehydration as a result.