A noteworthy first extraterrestrial ISRU demonstration is conducted with MOXIE, which is an oxygen production system and component of the Mars rover Perseverance . Hoffman et al. report that seven experiments under both diurnal and nocturnal conditions yielded 50 g of oxygen produced from CO₂ in the Martian atmosphere. Thus, experimental demonstration of the feasibility of ISRU at operating conditions at day and night is achieved. A further goal is the demonstration of in situ oxygen production with MOXIE during different Martian seasons with different ambient atmospheric pressures from 631 Pa to 757 Pa . Another promising concept for ISRU oxygen production is the pyrolysis of regolith, as demonstrated for lunar regolith by Šeško et al. .