Where does oxygen for astronauts come from? Are we just constantly sending rockets with tanks of oxygen up to the ISS?
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Mostly by passing electricity through water. When done properly, this will split the water molecules into hydrogen and oxygen, in a process called electrolysis.
So where do they get the water? Some of it is sent up by supply missions, but a lot of it comes from recycling and purifying waste water, including urine and sweat.
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