Three articles published in the journal “Science” describe as many researches on asteroid Ryugu. Three teams of researchers used the data collected by the Japanese space agency JAXA’s Hayabusa2 space probe to obtain the first precise descriptions of the characteristics of Ryugu and in particular its geology. The portrait that comes out is that of a porous asteroid containing hydrated minerals and at the same time very little water. It probably formed by a part of the debris of a larger asteroid that got destroyed.