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

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" 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. "

" 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. "

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

" 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. "

" 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. "

" I'm a real klutz computationally, so Mathematica is just ideal for me. "

" Wormholes - if you don't have something threading through them to hold them open, the walls will basically collapse so fast that nothing can go through them. "

" 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. "

" 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. "

" If you think that the distance from the Earth to the nearest planet where we could live comfortably... is being, like, from New York to Australia... what we've achieved so far, in going to the moon, that's about two-and-a-half inches. So that's the challenge. "

" 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. "

" 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. "

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

" 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. "

" 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. "

" Black holes do not emit light, so you visualize them through gravitational lensing - how they bend light from other objects. "

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

" 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. "

" 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. "

" 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. "

" 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. "

" 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. "

" 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. "

" 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. "

" 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. "

" Each black hole spins on its axis like the Earth spins. That spin creates two vortexes of twisting space, somewhat like vortexes in a bathtub or a whirlpool. "

" As early as I can remember, I wanted to be a snowplow driver. When you grow up in the Rocky Mountains, like I did, you see the snow drifts piled up six feet high, and you're two feet, so it's impressive. "

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

" The human race has a yearning to explore. That's part of our biological and psychological makeup. "