Editing Invariant speed

{{Short description|Concept in relativistic physics}}
The '''[[Invariant (physics)|invariant]] speed''' or '''observer invariant speed''' is a speed which is measured to be the same in all [[reference frames]] by all observers.  The invariance of the [[speed of light]] is one of the [[postulates of special relativity]], and the terms ''speed of light'' and ''invariant speed'' are often considered synonymous.  In non-relativistic [[classical mechanics]], or Newtonian mechanics, finite invariant speed does not exist (the only invariant speed predicted by Newtonian mechanics is infinity).<ref>{{cite book | author=Rindler, Wolfgang | author-link=Wolfgang Rindler | title=Relativity: Special, General and Cosmological | publisher=Oxford University Press | year=2001 | isbn =0-19-850836-0 }}</ref><ref>{{cite journal | last=Mermin | first=N. David |author-link=David Mermin| title=Relativity without light | journal=American Journal of Physics | publisher=American Association of Physics Teachers (AAPT) | volume=52 | issue=2 | year=1984 | issn=0002-9505 | doi=10.1119/1.13917 | pages=119–124| bibcode=1984AmJPh..52..119M }}</ref>

== See also ==
*[[Variable speed of light]]
*[[Red Queen's race]]
*[[Minkowski diagram]]
*[[Speed of gravity]]

== References ==
{{Reflist}}

[[Category:Theory of relativity]]


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