My dad was frequently asked by interviewers and fans if he “believed” in the existence of extraterrestrials. “I don’t know,” he would say “I don’t have enough evidence.” This would sometimes frustrate people, and there were a lot of follow-up questions about his gut or his instincts. My dad really wanted to know if there were aliens, and if there were, he wanted to know everything about them, but he refused to let his deepest wishes fog his judgment. He was a devout scientist.

