A Primer on Long-Duration Life Support

5 days ago

Life support is a major technical challenge for Mars exploration, with daily astronaut needs including 0.84 kg oxygen, 2.8 kg water, and 1.8 kg dried food.
Recycling is essential for missions over 30 days; the ISS recovers ~98% of water through heat exchangers, urine distillation, brine drying, and fecal processing, with diminishing returns.
Carbon dioxide removal requires reliable systems; the ISS uses zeolite beds, but levels remain high, and oxygen can be generated via electrolysis, though hydrogen byproducts pose challenges.
Food must be nutritious, storable for five years without refrigeration, and palatable; current options like MREs are inadequate, and plant growth is unreliable for core nutrition.
Waste management includes fecal vacuum-sealing and storage challenges, while medicine requires understanding drug effects in space and handling emergencies like surgery or fire.
Fire safety is critical, as seen in a 1997 Mir incident; spacecraft must manage combustion products, and exercise is mandated to combat bone and muscle loss, though alternatives like drugs are under study.
Laundry and stowage present volume constraints; disposable clothing creates waste, while washing adds wastewater, and tight spaces complicate storage and access to supplies.

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