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Cosmic string
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== Potential applications == In 1986, [[John G. Cramer]] proposed that spacecraft equipped with magnet coils could travel along cosmic strings, analogous to how a [[maglev]] train travels along a rail line.<ref>{{Cite web |title=Alternate View Column AV-19 |url=https://www.npl.washington.edu/av/altvw19.html |access-date=2024-08-15 |website=www.npl.washington.edu}}</ref>
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