 This ‘discovery-class-of-finding’ by CHACE was achieved by direct in situ measurement of the lunar atmosphere during the descend journey of the MIP to the Lunar South Pole, while M3 discovered water in ice form by remote sensing techniques.As water cannot retain its liquid phase in the lunar environment because of its own vapour pressure and the ultra-high vacuum prevailing there, it can be found in solid (ice) and gaseous (vapour) phases.While the Moon Mineralogy Mapper (M3), a payload by NASA, on board Chandrayaan I lunar orbiter has detected, by mapping almost 97% of the lunar surface using remote sensing techniques, the presence of water in ice form in higher latitudes especially in the polar caps, the CHACE payload in the lunar impactor (MIP) has directly detected water in its gaseous form along 14 degree E meridian from 45 degree N to 90 degree S latitude, with a latitudinal resolution of around 0.10 and altitudinal resolution of ~ 250 m from 98 km altitude till impact .