Editing Intergalactic travel (section)

===Superluminal methods===
The [[Alcubierre drive]] is a hypothetical concept that is able to propel a spacecraft to speeds [[faster-than-light|faster than light]] (the spaceship itself would not move faster than light, but the space around it would). This could in theory allow practical intergalactic travel. There is no known way to create the space-distorting wave this concept needs to work, but the metrics of the equations comply with relativity and the limit of light speed.<ref name="Christopher Pike">{{cite journal|author=Alcubierre, Miguel|title=The warp drive: hyper-fast travel within general relativity|journal=[[Classical and Quantum Gravity]] |year=1994|volume=11|pages=L73–L77|doi=10.1088/0264-9381/11/5/001|arxiv = gr-qc/0009013 |bibcode = 1994CQGra..11L..73A|issue=5|s2cid=4797900}}</ref>

A [[wormhole]] is a hypothetical tunnel through space-time that would allow instantaneous intergalactic travel to the most distant galaxies even billions of light years away. Wormholes are allowed by [[general relativity]].<ref>{{cite web |url=https://www.sciencefocus.com/space/wormholes-could-we-travel-through-a-black-hole-into-another-galaxy/ |title=Wormholes: Could we travel through a black hole into another galaxy? |first1=Robert |last1=Matthews |date=20 December 2019 |publisher=Sciencefocus.com |access-date=13 June 2021 }}</ref>