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In what has been called the most important breakthrough in more than a century, scientists in the United States say they've successfully detected gravitational waves. To discuss the interplay between science fiction and science fact, Newshour spoke to Professor Lawrence Krauss, a theoretical physicist, cosmologist and author of - among other books - 'The Physics of Star Trek' (Photo: Computer simulation showing how our sun and Earth warp space and time. Credit: REUTERS/Caltech/MIT/LIGO Laboratory).