How Astronauts Breathe and Survive in Space Staying alive in space is no simple task. On Earth, breathing is effortless because oxygen is everywhere. But in space, there is none. Oxygen is available only up to 120 kilometres above Earth. Beyond that, the lack of gravity means gases do not stay together. Without an atmosphere, astronauts cannot breathe naturally. So how do they survive? We show you how to get the oxygen you need to survive in space. Back to Mail Online home.Back to the page you came from. Back To the pageyou came from, we hope you will agree with our guide to surviving in space and how you can get more information about our mission to the moon and back to Earth. Click here to read the full article. We hope to hear from you again soon! Back to the pages you come from, We hope you’ll agree that this guide to survival in space will help you stay alive in the future. Back into the page we hope to see you again.