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NASA's Perseverance rover on Mars has made oxygen from the planet's carbon dioxide atmosphere. It is the second successful technology demonstration on the mission, which flew a mini-helicopter last Friday. The generation of oxygen was performed by a toaster-sized unit in the rover called Moxie - the Mars Oxygen In-Situ Resource Utilization Experiment.
 
It made 5 grams of the gas - equivalent to what an astronaut at Mars would need to breathe for roughly 10 minutes. 

NASA is planning that future human missions would take scaled-up versions of Moxie with them to the Red Planet rather than try to carry all the oxygen needed to sustain them.
 
Mars' atmosphere is dominated by carbon dioxide (CO₂) at a concentration of 96 per cent. The expectation is that it can produce up to 10 grams of O₂ per hour.



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