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" If the rate of expansion one second after the Big Bang had been smaller by even one part in a hundred thousand million million, it would have recollapsed before it reached its present size. On the other hand, if it had been greater by a part in a million, the universe would have expanded too rapidly for stars and planets to form. "

Stephen Hawking

Universe

Size

Present

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" One cannot really argue with a mathematical theorem. "

" I have a full and satisfying life. My work and my family are very important to me. "

" Our population and our use of the finite resources of planet Earth are growing exponentially, along with our technical ability to change the environment for good or ill. "

" With genetic engineering, we will be able to increase the complexity of our DNA, and improve the human race. But it will be a slow process, because one will have to wait about 18 years to see the effect of changes to the genetic code. "

" We are all now connected by the Internet, like neurons in a giant brain. "

Stephen Hawking

Now

Connected

" There's no way to remove the observer - us - from our perceptions of the world. "

" To my mathematical brain, the numbers alone make thinking about aliens perfectly rational. The real challenge is to work out what aliens might actually be like. "

" Some forms of motor neuron disease are genetically linked, but I have no indication that my kind is. No other member of my family has had it. But I would be in favour of abortion if there was a high risk. "

" The doctor who diagnosed me with ALS, or motor neuron disease, told me that it would kill me in two or three years. "

" God not only plays dice, He also sometimes throws the dice where they cannot be seen. "

" I believe there are no questions that science can't answer about a physical universe. "

" It's a pity that nobody has found an exploding black hole. If they had, I would have won a Nobel prize. "

" I have found far greater enthusiasm for science in America than here in Britain. There is more enthusiasm for everything in America. "

" Among physicists, I'm respected I hope. "

" Wagner manages to convey emotion with music better than anyone, before or since. "

" Keeping an active mind has been vital to my survival, as has been maintaining a sense of humor. "

" Cosmology is a rapidly advancing field. "

" Even if it turns out that time travel is impossible, it is important that we understand why it is impossible. "

" I was not a good student. I did not spend much time at college; I was too busy enjoying myself. "

" The whole history of science has been the gradual realization that events do not happen in an arbitrary manner, but that they reflect a certain underlying order, which may or may not be divinely inspired. "

" However difficult life may seem, there is always something you can do and succeed at. "

" We only have to look at ourselves to see how intelligent life might develop into something we wouldn't want to meet. "

" Not only does God play dice, but... he sometimes throws them where they cannot be seen. "

" In less than a hundred years, we have found a new way to think of ourselves. From sitting at the center of the universe, we now find ourselves orbiting an average-sized sun, which is just one of millions of stars in our own Milky Way galaxy. "

" In my school, the brightest boys did math and physics, the less bright did physics and chemistry, and the least bright did biology. I wanted to do math and physics, but my father made me do chemistry because he thought there would be no jobs for mathematicians. "

" It's time to commit to finding the answer, to search for life beyond Earth. Mankind has a deep need to explore, to learn, to know. We also happen to be sociable creatures. It is important for us to know if we are alone in the dark. "

" Time travel used to be thought of as just science fiction, but Einstein's general theory of relativity allows for the possibility that we could warp space-time so much that you could go off in a rocket and return before you set out. "

" I first had the idea of writing a popular book about the universe in 1982. My intention was partly to earn money to pay my daughter's school fees. "

" Imaginary time is a new dimension, at right angles to ordinary, real time. "