Astronauts may live a life most of us can only dream of, but they also need to go to the toilet just like everyone else! And the absence of gravity obviously complicates things slightly. On board the ISS (International Space Station), astronauts have to use high-end toilets that cost up to $20 million each. Once carefully sealed in airtight bags, their solid excrement is ejected into space and burns up as it enters the Earth’s atmosphere. Think about that the next time you see a shooting star...