According to Fermi, Earth should have already been visited or at least contacted by aliens. But since there has been no evidence presented of intelligent extraterrestrial life, many doubt the very existence of alien civilizations.
Popular Categories
Previous article![E212 Thoughts of China’s Astronomers on Advanced Extraterrestrial Life]( "E212 Thoughts of China’s Astronomers on Advanced Extraterrestrial Life")
Next article![E214 Theologian Examines If the Discovery of Alien Life Could Kill Religion]( "E214 Theologian Examines If the Discovery of Alien Life Could Kill Religion")
