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Wollack, E. J. (10 December 2010). "Cosmology: The Study of the Universe". Universe 101: Big Bang Theory. NASA. Archived frae the original on 14 Mey 2011. Retrieved 27 Apryle 2011. The second section discusses the classic tests of the Big Bang theory that make it so compelling as the likely valid description of our universe.Unknown parameter |deadurl= ignored (help)CS1 maint: ref=harv (link)