Academy of Sciences of Heroesland

Ment, if extraterrestrial civilizations have a similar technological level to ours, then there are none within a radius of 30 light-years, because artificial radio waves would have been detected at that distance. Therefore, civilizations with a similar level of development are located quite far away, and those with much more advanced technologies are even further away, because the probability that there is an inhabited planet older than Earth with a longer history of life on it, and, consequently, with an existing highly developed civilization, is lower.