bookafnd reviewed Extraterrestrial Civilizations by Isaac Asimov
Ever since the concept of other worlds was put forward in the fifth century BC, …
dated, but reasonably good
4 stars
it's essentially a long exploration of the drake equation. being from 1979, the science is a bit out of date—for example, there were no confirmed exoplanets at the time. it seems to mostly hold up, though (to me, someone who is Very Not an astrophysicist).