closed-loop life support

Syllable breakdown

Dictionary meaning

a life support system design philosophy in which waste products — including carbon dioxide exhaled by crew, urine, wastewater, and solid waste — are processed and recycled back into usable resources such as oxygen, drinking water, and food, rather than being vented, stored, or discarded; closed-loop life support is essential for long-duration deep space missions to Mars and beyond where resupply from Earth is impossible or prohibitively expensive; the International Space Station operates a partially closed system that recovers water from urine and cabin humidity but still requires periodic resupply; a fully closed biological life support system would ideally incorporate photosynthetic organisms and food crops that absorb carbon dioxide and release oxygen while producing nutrition, creating a miniature biosphere capable of sustaining crew indefinitely