There are in fact 100 billion galaxies, each of which contain something like a 100 billion stars. Think of how many stars, and planets, and kinds of life there may be in this vast and awesome universe.
Carl SaganWriting a novel is like trying to solve a very long mathematical equation. Changing anything can change everything else.
Carl SaganI think if we ever reach the point where we think we thoroughly understand who we are and where we came from, we will have failed.
Carl Sagan