What is space agency NASA's problem with poo?
28 November 2016 Last updated at 15:35 GMT
Going to the toilet in zero-gravity can be a tricky task and NASA wants your help to make it a little bit easier for astronauts.
The problem is, when on a spacecraft, zipped up in a spacesuit, with no toilet in sight and a crew of other astronauts around, it can be a little difficult to relieve yourself!
Now NASA want YOUR ideas for a poo-removal system that will handle everything for up to SIX days.
Check out our video...