Tidsrejse: Forskelle mellem versioner
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== Relativitetsteorien og tidsrejser ==
[[Albert Einstein|Einsteins]] [[specielle relativitetsteori]] forudsiger at mennesker, som rejser med [[flyvemaskine|fly]] eller [[raket]]ter i længere tid, ældes lidt mindre end folk på jorden. Det er et faktum, som er målt med [[atomur]]e i militærfly.
<ref>[https://web.archive.org/web/20070713035115/http://www.sciam.com/article.cfm?articleID=0004226A-F77D-1D4A-90FB809EC5880000 September 2002 issue, Scientific American: How to Build a Time Machine. It wouldn't be easy, but it might be possible] Citat: "...Even at aircraft speeds, the time dilation in a typical journey amounts to just a few nanoseconds...atomic clocks are accurate enough to record the shift and confirm that time really is stretched by motion. So travel into the future is a proved fact, even if it has so far been in rather unexciting amounts...Gravity is another. In his general theory of relativity, Einstein predicted that gravity slows time. Clocks run a bit faster in the attic than in the basement..."</ref>
<ref>[http://www.sns.ias.edu/~dejan/CCS/work/news/Gott_interview/J.Richard.Gott.III.eng.html J. Richard Gott, III – Time Travel] Citat: "...Did you know that we have already traveled in time?...J.Richard Gott, III, a professor of astrophysics at Princeton University is one of the leading cosmologists of our time..."</ref>
Dermed er der banet vej for det såkaldte [[tvillingeparadokset|tvillingeparadoks]] (som slet ikke er et paradoks, men bare et mærkeligt resultat af teorien): Hvis den ene af to enæggede tvillinger tager af sted i en rumraket og i lang tid rejser nær lysets hastighed, vil han, når han vender tilbage til jorden, være yngre end sin bror. Han er altså rejst frem i tiden. Denne form for tidsrejser levner dog ikke mulighed for sensationen, at kunne rejse tilbage i tiden.
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