Teoria speciale e relativitetit: Dallime mes rishikimesh

[[File:Albert Einstein 1979 USSR Stamp.jpg|thumb|250px|Stampë poste e BRSS dedikuar Albert Ajnshtajnit]]

 

 

This theory has a wide range of consequences which have been experimentally verified,<ref>{{cite web | url = http://www.edu-observatory.org/physics-faq/Relativity/SR/experiments.html | title = What is the experimental basis of Special Relativity? | accessdate = 2008-09-17 | author = Tom Roberts and Siegmar Schleif | year = 2007 | month = October | work = Usenet Physics FAQ}}</ref> including counter-intuitive ones such as [[length contraction]], [[time dilation]] and [[relativity of simultaneity]], contradicting the classical notion that the duration of the time interval between two events is equal for all observers. (On the other hand, it introduces the [[space-time interval]], which ''is'' invariant.) Combined with other laws of physics, the two postulates of special relativity predict the equivalence of [[matter]] and [[energy]], as expressed in the [[mass-energy equivalence]] formula ''E''&nbsp;=&nbsp;''mc''², where ''c'' is the [[speed of light]] in a vacuum.<ref name=relativity>{{cite book |author=Albert Einstein |title=Relativity: The Special and the General Theory |page= 48 |url=http://books.google.com/books?id=idb7wJiB6SsC&pg=PA50 |isbn=0415253845 |publisher=Routledge |year=2001 |edition=Reprint of 1920 translation by Robert W. Lawson }}</ref><ref name=Feynman>{{cite book |title=Six Not-so-easy Pieces: Einstein's relativity, symmetry, and space-time |author=Richard Phillips Feynman |page= 68 |url=http://books.google.com/books?id=ipY8onVQWhcC&pg=PA68 |isbn=0201328429 |publisher=Basic Books |edition=Reprint of 1995 |year=1998}}</ref> The predictions of special relativity agree well with Newtonian mechanics in their common realm of applicability, specifically in experiments in which all velocities are small compared to the speed of light. Special relativity reveals that ''c'' is not just the velocity of a certain phenomenon—namely the propagation of [[electromagnetic radiation]] (light)—but rather a fundamental feature of the way space and time are unified as [[spacetime]]. One of the consequences of the theory is that it is impossible for any particle that has [[rest mass]] to be accelerated to the speed of light.