The twentieth century saw man's view of the universe transformed: we realized the insignificance of our planet in the vastness of the universe, and we discovered that time and space we curved and inseparable , that the universe was expanding, and that it had a beginning in time.

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You can’t get to a time before the Big Bang because there was no time before the Big Bang. We have finally found something that doesn’t have a cause, because there was no time for a cause to exist in.

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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.

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Money is not everything. There's Master card & Visa.

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Although I cannot move, and I have to speak through a computer, in my mind, I am free.

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We live in the most probable of all possible worlds.

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The laws of physics demand the existence of something called ‘negative energy’.

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We should seek the greatest value of our action.

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I used to think information was destroyed in black hole. This was my biggest blunder, or at least my biggest blunder in science.

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Galileo, perhaps more than any other single person, was responsible for the birth of modern science.

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