What If the Universe Was Shaped Like a Donut?

The universe could be a donut in a fourth spatial dimension. Which would mean that we could potentially see our own galaxy repeated from the past... Our 3D brains aren't ready for this.

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Host: Reid Reimers

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Sources:
http://www.nytimes.com/2003/03/11/science/universe-as-doughnut-new-data-new-debate.html
https://cosmosmagazine.com/physics/what-is-topology
https://phys.org/news/2015-05-universe.html
http://abyss.uoregon.edu/~js/cosmo/lectures/lec15.html
http://www.esa.int/Our_Activities/Space_Science/Is_the_Universe_finite_or_infinite_An_interview_with_Joseph_Silk
https://blogs.scientificamerican.com/roots-of-unity/a-few-of-my-favorite-spaces-the-three-torus/
https://www.nesi.org.nz/case-studies/studying-shape-and-size-universe
https://www.ucl.ac.uk/mssl/news/mssl-news/news-q1-2015/planck
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Images:
https://www.istockphoto.com/photo/single-pink-donut-gm696365602-128846505
https://www.istockphoto.com/photo/chocolate-donut-font-concept-delicious-number-8-gm831656820-135276297
https://www.istockphoto.com/photo/chocolate-donut-and-hot-coffee-gm517618915-48803692
http://www.spacetelescope.org/images/heic0406a/
https://en.wikipedia.org/wiki/Shape_of_the_universe#/media/File:End_of_universe.jpg
https://youtu.be/ZtzKqfg-vH8
https://map.gsfc.nasa.gov/media/121238/index.html
https://www.nasa.gov/multimedia/imagegallery/image_feature_1455.html