Why do astronauts breathe pure oxygen?

Related questions

1. Is breathing pure oxygen safe?
2. Does oxygen make u high?
3. How does oxygen bar work?
4. Can you live off pure oxygen?
5. How long does boost oxygen last?
6. How much is a oxygen bar?
7. What are the benefits of oxygen therapy?
8. What is the normal oxygen level for someone with COPD?
9. Do oxygen bars help hangovers?
10. Are oxygen bars profitable?

Tags

1. #suits
2. #hours
3. #astronaut
4. #space
5. #breathing
6. #ready
7. #breathe
8. #oxygen
9. #nitrogen
10. #bubbles
11. #spacecraft
12. #might
13. #astronauts
14. #walked
15. #their