"We are all time-travelers, heading into the future at the rate of one second per second."

"The greatest danger for our future is apathy."

"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."

"Some people say I have a chip on my shoulder but it is actually my chin."

"We are just an advanced breed of monkeys on a minor planet of a very average star. But we can understand the Universe. That makes us something very special."