"Look up at the stars and not down at your feet. Try to make sense of what you see, and wonder about what makes the universe exist. Be curious."

"The human failing I would most like to correct is aggression. It may have had survival advantage in caveman days, to get more food, territory or partner with whom to reproduce, but now it threatens to…"

"I think that the human race has a destiny to explore the universe."

"I don't think the human race will survive the next thousand years, unless we spread into space."

"I believe alien life is quite common in the universe, although intelligent life is less so. Some say it has yet to appear on planet Earth."