The Moon and Mars were the two most likely candidates for life in the solar system; what exists beyond our solar system is mere guesswork.
“Mortality means you don't have forever to work things out. You can live your life unexamined but then on the last day you're going to think: 'I've left things a little late.'”
“The German experience, as you can see, did move me very much. Seeing that terrible destruction and seeing the miserable state of the people, how they had been beaten down by the war through no fault of their own probably.”