"I have no idea what the future holds, but I'm optimistic."

"The human race is a single genetic stock, and we are all brothers and sisters. It's time that we started to act like it."

"If aliens ever visit us, I think the outcome would be much as when Christopher Columbus first landed in America, which didn't turn out very well for the Native Americans."

"There are no black holes in the sense of a region of spacetime from which nothing can escape. Instead, there are apparent horizons which persist for a time and then vanish."

"I believe that the universe is governed by the laws of science. The laws may have been decreed by God, but God does not intervene to break the laws."