mercantilism was the technologically advanced civilization that had made important advances in navigation by the 1300s.
which technologically advanced civilization had made important advances in navigation by the 1300s?
mercantilism
Na
Na
billingham has suggested that a civilization which is far more technologically advanced than humanity is also likely to be culturally and ethically advanced, and would therefore be unlikely to conduct astroengineering projects that would harm human civilization. such projects could include dyson spheres, which completely enclose stars and capture all energy coming from them. even if well within the capability of an advanced civilization and providing an enormous amount of energy, such a project would not be undertaken. for similar reasons, such civilizations would not readily give humanity the knowledge required to build such devices. nevertheless, the existence of such capabilities would at least show that civilizations have survived "technological adolescence". despite the caution that such an advanced civilization would exercise in dealing with the less mature human civilization, sagan imagined that an advanced civilization might send those on earth an "encyclopædia galactica" describing the sciences and cultures of many extraterrestrial societies.
potential cultural impact of extraterrestrial contact