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[[File:Black Hole Milkyway.jpg|thumb|260px|Simulisana [[crna rupa]] sa 10 [[Sunčeva masa|solarnih masa]] unutar [[Mlečni put|Mlečnog puta]], gledana sa rastojanja od 600 kilometera.]]
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'''Opšta relativnost''' ili '''opšta teorija relativnosti''' (OTR) [[fizika]]lna je [[Diferencijalna geometrija|geometrijska]] [[Teorijska fizika|teorija]] [[gravitacija|gravitacije]] koju je [[Albert Einstein|Albert Ajnštajn]] objavio u članku ''Osnove opšte teorije relativnosti'' ({{jez-nem|Die Grundlage der allgemeinen Relativitätstheorie}}), 1915. godine u ''[[Annalen der Physik]]''.<ref>Albert Einstein: ''Die Grundlage der allgemeinen Relativitätstheorie''. U: ''Annalen der Physik''. 49, 1916., S. 769–822 ([http://www.physik.uni-augsburg.de/annalen/history/papers/1916_49_769-822.pdf Faksimil], PDF)</ref><ref>O'Connor, J.J. and E.F. Robertson (1996), "[http://www-history.mcs.st-and.ac.uk/HistTopics/General_relativity.html General relativity]". ''[http://www-history.mcs.st-and.ac.uk/Indexes/Math_Physics.html Mathematical Physics index]'', [http://www.st-andrews.ac.uk/maths/ School of Mathematics and Statistics], [http://www.st-andrews.ac.uk/ University of St. Andrews], Scotland, May, 1996. Retrieved 2015-02-04.</ref> Teorija opšta relativnost predstavlja relativističko poopštenje [[specijalna relativnost|specijalne relativnosti]] i [[Isaac Newton|Newtonove]] teorije [[gravitacija|gravitacije]]. Ona pruža ujedinjeni opis gravitacije kao geometrijskog svojstva [[prostor]]a i [[Vreme u fizici|vremena]], ili [[prostor-vreme]]na. Specifično, [[zakrivljenost]] prostorvremenaprostor-vremena je direktno povezana sa [[energija|energijom]] i [[moment]]om nezavisno od tokatoga koja [[materija]] i [[radijacija]] su prisutne. Odnos je specificiran u [[Ajnštajnova jednačine polja|Ajnštajnovim jednačinama polja]], sistemu [[parcijalna diferencijalna jednačina|parcijalnih diferencijalnih jednačina]].
== Work in progress ==
Neka od predviđanja opšte relativnosti se znatno razlikuju od klasično fizičkih, especiallyposebno concerningu thepogledu passageprotoka of timevremena, thegeometrije geometry of spaceprostora, thekretanja motiontela of bodies inpri [[freeslobodni fallpad|slobodnom padu]], andi theprostiranja propagation of lightsvetlosti. Examples ofPrimeri suchtih differencesralika includeobuhvataju [[gravitational time dilation]], [[gravitational lens]]ing, the [[gravitational redshift]] of light, and the [[Shapiro delay|gravitational time delay]]. The predictions of general relativity have been [[tests of general relativity|confirmed]] in all observations and experiments to date. Although general relativity is [[Alternatives to general relativity|not the only relativistic theory of gravity]], it is the [[Occam's razor|simplest theory]] that is consistent with experimental data. However, unanswered questions remain, the most fundamental being how general relativity can be reconciled with the laws of [[quantum mechanics|quantum physics]] to produce a complete and self-consistent theory of [[quantum gravity]].
Einstein's theory has important astrophysical implications. For example, it implies the existence of [[black hole]]s—regions of space in which space and time are distorted in such a way that nothing, not even light, can escape—as an end-state for massive [[star]]s. There is ample evidence that the intense [[radiation]] emitted by certain kinds of astronomical objects is due to black holes; for example, [[microquasar]]s and [[active galactic nucleus|active galactic nuclei]] result from the presence of [[stellar black hole]]s and black holes of a [[supermassive black hole|much more massive type]], respectively. The bending of light by gravity can lead to the phenomenon of [[gravitational lens]]ing, in which multiple images of the same distant astronomical object are visible in the sky. General relativity also predicts the existence of [[gravitational wave]]s, which have since been observed indirectly; a direct measurement is the aim of projects such as [[LIGO]] and NASA/ESA [[Laser Interferometer Space Antenna]] and various [[pulsar timing array]]s. In addition, general relativity is the basis of current [[Physical cosmology|cosmological]] models of a consistently [[Metric expansion of space|expanding universe]].
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