Cosmic string
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Negative mass
Negative
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White hole
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Effective mass (solid-state physics)
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Electron hole
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Gravitational binding energy
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Phonon
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Warp drive
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Accelerating expansion of the universe
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Gregory Benford
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Alcubierre drive
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Wormhole
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Tachyon
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Faster-than-light communication
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Interstellar travel
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General relativity
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Dark matter
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Negative gravity
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