The Second Atmosphere

In the early solar system, there was no free oxygen. This second atmosphere is not something we can breathe at all. It would be totally toxic. You took a time machine back to this volcanic period of the earth, and you took a deep breath as you stepped out, you would die pretty quickly. Not a great place to visit? No, exactly. But bring your spacesuit, you know, no big deal. Pack some oxygen. Yes, jus pack oxygen for 50 years. There's one other source of sobasic ingredients for our atmosphere. In those early days, it didn't just come from inside the earth. There were some deposits from outside the earth. Some rocks have