At first, the option of Villafranca del Castillo (Madrid) was considered, where ESA already has a Space Astronomy Center (ESAC), but it was discarded due to its accelerated urban development, which would have been, without a doubt, a safe source of interference.
Nun principio barallouse a opción de Villafranca do Castillo (Madrid), onde a ESA xa dispón dun Centro de Astronomía Espacial (ESAC), pero foi descartada debido ao seu acelerado desenvolvemento urbanístico, que sería, sen dúbida, unha fonte segura de interferencias.