For example, in the 1970s, the gravity field disturbances above lunar maria were measured through lunar orbiters, which led to the discovery of concentrations of mass, mascons, beneath the Imbrium, Serenitatis, Crisium, Nectaris and Humorum basins.
Primjerice, u 1970-ima smetnje u gravitacijskom polju iznad lunarnih mora mjerili su lunarni orbiteri što je dovelo do otkrića o masenim koncentracijama, maskonima, ispod bazena Imbrium, Serenitatis, Crisium, Nectaris i Humorum.