Astronaut Jeremy Hansen leaving Canadian Space Agency

How does the space station never run out of oxygen? - Alvaro Romero-Calvo and Theo St Francis

We asked our astronaut Alexander Gerst to blind rank some of the experiences of living aboard the ISS, here's how it went. 🧑‍🚀 Alexander Gerst is a German ESA astronaut and geophysicist with 363 days of spaceflight experience. Across his two long-duration missions, Blue Dot (2014) and Horizons (2018), he conducted hundreds of scientific experiments, completed a six-hour spacewalk, and served as commander of the International Space Station. He now leads Astronaut Operations at the European Astr