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"Brian Greene defends string theory against recent criticism."
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SPACE as defined by Wikipedia.org : "In Astronomy, space refers collectively to the relatively empty parts of the Universe. Any area outside the atmospheres of any celestial body can be considered 'space'. Although space is certainly spacious, it is not always empty, but can be filled with matter - say a tenuous plasma. In particular, the boundary between space and Earth's atmosphere is conventionally set at the Karman line."
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