The Copernicus Principle and the Existence of Extraterrestrial Life

In this chapter, they discuss the concept of the Copernicus principle in cosmology, which states that the Earth is not special and there is no particular position in the universe that is unique. They question why, if the Copernican model suggests that Earth is not in a special place and the universe is homogenous, there hasn't been a widespread acceptance of the existence of extraterrestrial life.