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" We're going to need a definitive quantum theory of gravity, which is part of a grand unified theory - it's the main missing piece. "

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" I have used movies to go to sleep at night. You flip from channel to channel to channel and see just enough to make your brain mushy and go to sleep. "

" If you have somebody who's brilliant and highly creative with a different point of view than you have, and a very different intellectual background, great things can happen. "

" The jury is not in, so we just don't know. But there are very strong indications that wormholes that a human could travel through are forbidden by the laws of physics. That's sad, that's unfortunate, but that's the direction in which things are pointing. "

" Whether you can go back in time is held in the grip of the law of quantum gravity. "

" I do hope that 'Interstellar' and this kind of science in film will catch the public fancy and help to reignite an interest in science - and a respect for the power of science in dealing with the problems that society has to deal with. "

" I can enjoy 'Harry Potter' and 'Star Trek,' but I really appreciate hard science fiction. "

" We're born with a curiosity about the universe. Those people who don't have a curiosity don't have it because it's gotten beaten out of them in some way. "

" I think that the future of the human race is to spread through the universe, and now is the time that we should be laying the foundations for that. "

" When you fall into a black hole, everything that falls in after you over millions of years, as seen by you inside the black hole, comes pounding down on you in a fraction of a second, because of the enormous differences of time flow. "

" Our universe - it's three-dimensional, but we can pretend it's two-dimensional so it's like this sheet of paper - and we live in Pasadena over here and London is over there, and it's thousands of miles from Pasadena to London. "

" The essential point is that, although coordinates are a powerful, and sometimes essential, tool in many calculations, the fundamental laws of physics can be expressed without the aid of coordinates; and, indeed, their coordinate-free expressions are generally elegant and exceedingly powerful. "

" If you have a wormhole, then you can turn them into time machines for going backward in time. "

" It was quite a surprise when I realized that with a single wormhole you could have time hook up towards the future or towards the past and that you can actually manipulate the wormhole and change how time hooked up. "

" I became interested in this question of whether you can build wormholes for interstellar travel. I realized that if you had a wormhole, the theory of general relativity by itself would permit you to go backward in time. "

" As a true scientist, I have been proved wrong so many times that I'm very humble. "

" I got a lot of notoriety early on. Much of my career I was just trying to prove I was as good as the world thought I was. "

" I can't imagine not being in a phase where I'm trying to understand something or create something. That's the essence of life. "

" When Galileo first trained his optic telescope on the heavens and opened up modern optical astronomy, that was the first of the electromagnetic windows out of the universe: light. "

" We'll have four different gravitational wave windows open within the next 20 years, and each of them will see something different. We'll be probing the birth of the universe with this. The so-called 'inflationary era' of the universe. We'll be probing the birth of the fundamental forces and how they came into being. "

" I wanted to be a snowplow driver when I was a kid. Growing up in the Rocky Mountains, that's the most glorious job you can imagine. But then my mother took me to a lecture about the solar system when I was 8, and I got hooked. "

" A big misconception is that a black hole is made of matter that has just been compacted to a very small size. That's not true. A black hole is made from warped space and time. "

" When gravitational waves reach the earth, the waves stretch and squeeze space. This is a tiny stretch and squeeze. Far too small to detect with ordinary human senses. "

" If you go down through the horizon of a black hole, at the center you don't find a tunnel that leads you to some other place in the universe. "

" When I ask myself what are the great things we got from the Renaissance, it's the great art, the great music, the science insights of Leonardo da Vinci. Two hundred years from now, when you ask what are the great things that came from this era, I think it's going to be an understanding of the universe around us. "

" Gravitational waves will bring us exquisitely accurate maps of black holes - maps of their space-time. Those maps will make it crystal clear whether or not what we're dealing with are black holes as described by general relativity. "

" We have to have a combination of general relativity that describes the warping of space and time, and quantum physics, which describes the uncertainties in that warping and how they change. "

" A black hole really is an object with very rich structure, just like Earth has a rich structure of mountains, valleys, oceans, and so forth. Its warped space whirls around the central singularity like air in a tornado. "

" My passion is to understand the non-linear dynamics of warped space-time, and the ideal venue for this is black-hole collisions. "

" In subjects that physicists think of as purely quantum, classical ideas and classical computational techniques can often be powerful. "

" 'Closed timelike curve' is the jargon for time travel. It means you go out, come back and meet yourself in the past. "