American - Physicist | June 1, 1940 -
Whether you can go back in time is held in the grip of the law of quantum gravity.
Kip Thorne
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Sending people into space is very important culturally. That's really the justification. You cannot rationally justify it on the basis of the science and technology we get out of it.
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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.
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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.
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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.
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We see no objects in our universe that could become wormholes as they age.
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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.
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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.
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If you have a wormhole, then you can turn them into time machines for going backward in time.
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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.
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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.
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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.
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