{{uddybende|Ormehul}}
Et ormehul, rumtidstunnel<ref>[http://videnskab.dk/miljo-naturvidenskab/maelkevejen-rummer-muligvis-tunnel-til-en-anden-verden 22. februar 2015, videnskab.dk: Mælkevejen rummer muligvis tunnel til en anden verden.]</ref> eller [[Albert Einstein|Einstein]]-[[Nathan Rosen|Rosen]] bro er en hypotetisk egenskab af [[rumtiden]].  [[Hermann Weyl]] opstillede i 1928 en hypotese om et fænomen, som er en slags tunnel, hvor det er muligt at rejse gennem [[rum]] og [[tid]].<ref>[http://www.pbs.org/wgbh/nova/transcripts/2612time.html NOVA #2612: Time Travel], [http://www.cco.caltech.edu/~kip/ Kip Thorne], {{dmoz|Science/Physics/Relativity/Time_Travel/|Time Travel}}</ref><ref name="DIA">[https://info.publicintelligence.net/DIA-WarpDrives.pdf Defense Intelligence Reference Document. Acquisition Threat Support: 2 April 2010, Warp Drive, Dark Energy, and the Manipulation of Extra Dimensions] Citat: "...In recent years, however physicists have discovered two loopholes to Einstein's ultimate speed limit: the Einstein-Rosen bridge (commonly referred to as "wormhole") and the [[Alcubierre-drev|warp drive]]. Fundamentally, both ideas involve manipulation of spacetime itself in some exotic way that allows for faster-than-light (FTL) travel...Essentially, the wormhole involves connecting two potentially distant regions of space by a topological shortcut. Theoretically, one would would enter the wormhole and instantaneously be transported to the exit located in a distant region of space. Although no observational evidence of wormholes exists, theoretically they can exist as a valid solution to [[Generel relativitetsteori|general relativity]]...", [https://web.archive.org/web/20180507000732/https://info.publicintelligence.net/DIA-WarpDrives.pdf backup]</ref>
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