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===Spacetime distortion=== Although the theory of [[special relativity]] forbids objects to have a relative velocity greater than light speed, and [[general relativity]] reduces to special relativity in a local sense (in small regions of spacetime where curvature is negligible), general relativity does allow the space between distant objects to expand in such a way that they have a "[[recession velocity]]" which exceeds the speed of light, and it is thought that galaxies which are at a distance of more than about 14 billion light-years from us today have a recession velocity which is faster than light.<ref name="ly93" /> [[Miguel Alcubierre]] theorized that it would be possible to create a [[Alcubierre drive|warp drive]], in which a ship would be enclosed in a "warp bubble" where the space at the front of the bubble is rapidly contracting and the space at the back is rapidly expanding, with the result that the bubble can reach a distant destination much faster than a light beam moving outside the bubble, but without objects inside the bubble locally traveling faster than light.<ref>{{cite journal |last1=Alcubierre |first1=Miguel |title=The warp drive: hyper-fast travel within general relativity |journal=Classical and Quantum Gravity |date=1 May 1994 |volume=11 |issue=5 |pages=L73βL77 |doi=10.1088/0264-9381/11/5/001|arxiv=gr-qc/0009013 |citeseerx=10.1.1.338.8690 |bibcode=1994CQGra..11L..73A|s2cid=4797900 }}</ref> However, [[Alcubierre drive#Difficulties|several objections]] raised against the Alcubierre drive appear to rule out the possibility of actually using it in any practical fashion. Another possibility predicted by general relativity is the [[wormhole#Traversable wormholes|traversable wormhole]], which could create a shortcut between arbitrarily distant points in space. As with the Alcubierre drive, travelers moving through the wormhole would not ''locally'' move faster than light travelling through the wormhole alongside them, but they would be able to reach their destination (and return to their starting location) faster than light traveling outside the wormhole. Gerald Cleaver and Richard Obousy, a professor and student of [[Baylor University]], theorized that manipulating the extra spatial dimensions of [[string theory]] around a spaceship with an extremely large amount of energy would create a "bubble" that could cause the ship to travel faster than the speed of light. To create this bubble, the physicists believe manipulating the 10th spatial dimension would alter the [[dark energy]] in three large spatial dimensions: height, width and length. Cleaver said positive dark energy is currently responsible for speeding up the expansion rate of our universe as time moves on.<ref>{{Cite web |title=Traveling Faster Than the Speed of Light: A New Idea That Could Make It Happen |url=https://www.newswise.com/articles/traveling-faster-than-the-speed-of-light-a-new-idea-that-could-make-it-happen |access-date=2023-08-24 |website=www.newswise.com |language=en}}</ref>
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