An article published in the journal “Proceedings of the National Academy of Sciences” describes three specific traces of the presence of water ice on the surface of the Moon. A team led by Shuai Li of the University of Hawaii and Brown University used data collected by the Chandrayaan-1 space probe’s Moon Mineralogy Mapper spectrometer to find traces of that ice concentrated in lunar craters at the south pole and spread in an wider area at the north pole.