Carl Sagan

After the earth dies, some 5 billion years from now, after it’s burned to a crisp, or even swallowed by the Sun, there will be other worlds and stars and galaxies coming into being – and they will know nothing of a place once called Earth.

Carl Sagan

All civilizations become either spacefaring or extinct.

Carl Sagan

All colours are arbitrary.

Carl Sagan

All inquires carry with them some element of risk. There is no guarantee that the universe will conform to our predispositions.

Carl Sagan

All of the books in the world contain no more information than is broadcast as video in a single large American city in a single year. Not all bits have equal value.

Carl Sagan

An atheist has to know more than I know. An atheist is someone who knows there is no God.

Carl Sagan

An atheist is someone who is certain that God does not exist, someone who has compelling evidence against the existence of God. I know of no such compelling evidence.

Carl Sagan

An organism at war with itself is doomed.

Carl Sagan

Any civilization that doesn’t develop space travel dies.

Carl Sagan

Anything you don’t understand, you attribute to God. God for you is where you sweep away all the mysteries of the world, all the challenges to our intelligence. You simply turn your mind off and say God did it.

Carl Sagan