NRO (Nobeyama Radio Observatory) held its 2010 Open Campus on August 21. The weather was beautiful, and as many as 3,278 visitors came to enjoy the event. In the exhibition area of ALMA and ASTE that are both radio telescopes constructed in Chile, we presented mini-lectures, exhibitions of posters and a diorama, and radio wave receiving simulation using small rubber balls. The picture shows Ken’ichi Tatematsu, Head of the ALMA-J Project Office explaining the mysteries of the universe to be explored by ALMA, the ultimate radio telescope.