Activity for kevâ€
| Type | On... | Excerpt | Status | Date |
|---|---|---|---|---|
| Question | — |
What is necessary for a breathable artificial atmosphere? For space travel: would you need to recreate earths air composition? Or could you just get by with the top 2 or 3 main components, i.e. either 78% nitrogen and 22% oxygen, or 78% nitrogen, 21% oxygen and 1% carbon dioxide? (more) |
— | over 7 years ago |