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Loading contentOn the Space Station, water and air can be topped up from Earth; on a multi-year voyage to Mars there is no resupply. Life support must therefore recycle almost everything — reclaiming water from every source and regenerating oxygen — and may ultimately grow food, closing the loop far more tightly than any system flown so far.
Facts on this topic will be cited from these primary and reference sources.
Mission data, planetary science, space telescopes, and public-domain imagery.
Most NASA-produced imagery is in the public domain; individual items are checked for usage terms before publication.