in-situ resource utilization

Syllable breakdown

Dictionary meaning

the extraction, processing, and use of materials found at a mission destination — such as the Moon, Mars, or an asteroid — to produce propellant, building materials, water, oxygen, or other resources needed to sustain human presence, rather than carrying everything needed from Earth; ISRU is considered a critical enabling technology for sustainable human exploration beyond low Earth orbit because the mass penalty of launching all consumables and construction materials from Earth makes indefinite human presence on other worlds economically and logistically impractical; on the Moon, ISRU concepts focus on extracting water ice from permanently shadowed polar craters and electrolyzing it into hydrogen and oxygen for propellant and life support; on Mars, the Sabatier reaction can combine atmospheric carbon dioxide with hydrogen to produce methane rocket propellant and water