As an expert in space technology and human factors, I can explain the process of how astronauts manage their bodily waste in space, particularly defecation. In space, the seated space toilet is designed to accommodate the pooping process. The toilet is equipped with a fan that generates a strong suction force. When an astronaut uses the toilet, their waste is drawn into a plastic bag by this suction. The astronaut then manually pushes down the bag into a solid waste container. This container is periodically replaced, roughly every 10 days, to maintain hygiene and prevent the accumulation of waste. It's also important to note that while solid waste is stored, urine is collected and sent through a recycling system where it is purified and made safe for consumption, highlighting the importance of resource conservation in space. read more >>

The seated space toilet, meant for pooping, has a fan connected to it that creates the suction. Waste ends up in a plastic bag that astronauts push down into a solid waste container, which is changed "roughly every 10 days," according to Cristoforetti. (Urine gets recycled, she noted.)read more >>