Marcio Jose Sanchez / AP

Jill Tarter (pictured above), an astronomer, on  searching for signs of extraterrestrial intelligence: “We worry, being in California, about all those post-graduates and Caltech students deliberately trying to fool us.”

Bruce Banerdt, of NASA, on planning a mission to Mars: “They’ve assured me it’s not magic. It’s science.”

Alan Chambers, a conservative Christian leader: “I look at gay and lesbian people who are in committed relationships and I believe they can reflect the image of God.”

(Previous quotes from our sources here)