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Sources:
http://carina.fcaglp.unlp.edu.ar/extragalactica/Bibliografia/Ryden_IntroCosmo.pdf
http://hyperphysics.phy-astr.gsu.edu/hbase/Astro/denpar.html
https://arxiv.org/pdf/1303.5076.pdf
https://arxiv.org/pdf/1401.1389.pdf
https://www.symmetrymagazine.org/article/april-2015/our-flat-universe?email_issue=725
https://arxiv.org/pdf/1502.01589.pdf
https://blogs.scientificamerican.com/degrees-of-freedom/httpblogsscientificamericancomdegrees-of-freedom20110731what-do-you-mean-the-universe-is-flat-part-ii/
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Images:
https://commons.wikimedia.org/wiki/File:Spacetime_curvature.png
http://www.spacetelescope.org/images/heic0406a/
https://en.wikipedia.org/wiki/Spherical_geometry#/media/File:Triangles_(spherical_geometry).jpg
https://commons.wikimedia.org/wiki/File:End_of_universe.jpg
https://commons.wikimedia.org/wiki/File:FirstNeutrinoEventAnnotated.jpg
https://commons.wikimedia.org/wiki/File:WMAP_2008_universe_content.png
https://www.nasa.gov/mission_pages/chandra/supernova-ejected-from-the-pages-of-history.html
http://carina.fcaglp.unlp.edu.ar/extragalactica/Bibliografia/Ryden_IntroCosmo.pdf (page 120)
https://svs.gsfc.nasa.gov/12656