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Cyclic model
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== External links == * [https://web.archive.org/web/20040110024422/http://feynman.princeton.edu/~steinh/ Paul J. Steinhardt], Department of Physics, Princeton University * [https://web.archive.org/web/20070218172218/http://www.physics.unc.edu/~frampton/ Paul H. Frampton], Department of Physics and Astronomy, The University of North Carolina at Chapel Hill *[https://web.archive.org/web/20070930204426/http://www.edge.org/video/dsl/turok07.html "The Cyclic Universe": A Talk with Neil Turok] *[https://www.youtube.com/watch?v=pEIj9zcLzp0 Roger Penrose—Cyclical Universe Model] {{Portal bar|Physics|Astronomy|Stars|Outer space}} {{Authority control}} [[Category:Physical cosmology]] [[Category:String theory]] [[Category:1920s in science]]
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