breathable+space

"Robert Zubrin, president of The Mars Society has developed a five step plan towards conquering the red planet and enabling humanity to establish a second home within the solar system."

space breathable science climate atmosphere mars robert terraforming colony time-scale zubrin

Making oxygen from recycled urine. I imagine the smell might piss you off after a while

system space air breathable recycling generation urine astronauts iss oxygen purified