In addition, if its production is based on renewable energy, the above processes are part of a cycle which is environmentally friendly, the so-called hydrogen cycle
The researchers noted that there is "uncertainty" about the effects of hydrogen gas on the atmosphere because "scientists still have a limited understanding of the hydrogen cycle
." Caltech assistant geochemistry professor and study co-author John Eiler said the impact of the hydrogen gas will depend largely on the Earth's ability to consume "anthropogenic hydrogen."
The end result would be a clean, natural hydrogen cycle
, with renewable energy used to split water into oxygen and hydrogen, with the latter used in fuel cells to produce electricity and water--which then would be available to repeat the process.
The two satellites would be equipped with identical instrument suites that would be capable of measuring the lunar hydrogen cycles
at both altitudes.