Extraordinary claims require extraordinary evidence. - Carl Sagan

"The cosmos is within us. We are made of star-stuff. We are a way for the universe to know itself."

"Science is based on experiment, on a willingness to challenge old dogma, on an openness to see the universe as it really is. Accordingly, science sometimes requires courage - at the very least the courage to question the conventional wisdom."

"A celibate clergy is an especially good idea, because it tends to suppress any hereditary propensity toward fanaticism."

"Somewhere, something incredible is waiting to be known."

"I consider it an extremely dangerous doctrine, because the more likely we are to assume that the solution comes from the outside, the less likely we are to solve our problems ourselves."