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Sources:
http://adsabs.harvard.edu/full/1983ApJ…270..365M7
http://adsabs.harvard.edu/full/1983ApJ…270..384M
http://adsabs.harvard.edu/full/1983ApJ…270..371M
https://arxiv.org/abs/1605.07458
https://xxx.lanl.gov/abs/astro-ph/9805120
https://www.nature.com/articles/s41550-018-0498-9
https://www.aanda.org/articles/aa/abs/2018/07/aa32547-17/aa32547-17.html
https://arxiv.org/abs/1211.4472
https://link.springer.com/article/10.12942/lrr-2012-10
http://www.astro.caltech.edu/~george/ay20/eaa-darkmatter-obs.pdf [PDF]
https://www.forbes.com/sites/startswithabang/2018/07/26/theres-a-debate-raging-over-whether-dark-matter-is-real-but-one-side-is-cheating/
http://www.sciencemag.org/news/2018/05/galaxy-simulations-are-last-matching-reality-and-producing-surprising-insights-cosmic
https://wmap.gsfc.nasa.gov/news/index.html
https://medium.com/starts-with-a-bang/this-is-how-our-earliest-picture-of-the-universe-shows-us-dark-matter-3d990f8b5621
http://www.nicadd.niu.edu/~bterzic/PHYS652/Lecture_10.pdf [PDF]
https://www.wired.com/story/troubled-times-for-alternatives-to-einsteins-theory-of-gravity/
https://www.scientificamerican.com/article/is-dark-matter-theory-or/
https://www.techtimes.com/articles/229186/20180602/worlds-most-sensitive-detector-establishes-limit-on-effective-size-of-dark-matter-particles.htm
https://www.nature.com/scientificamerican/journal/v319/n2/full/scientificamerican0818-36.html
http://astroweb.case.edu/ssm/mond/LSSinMOND.html
https://www.astro.umd.edu/~ssm/mond/moti_bullet.html
Galaxy rotation study rules out modified gravity, or does it?
https://tritonstation.wordpress.com/2018/06/19/the-acceleration-scale-in-the-data/
Images:
https://svs.gsfc.nasa.gov/12907
https://svs.gsfc.nasa.gov/10135
https://commons.wikimedia.org/wiki/File:Ilc_9yr_moll4096.png
https://en.wikipedia.org/wiki/File:Spacetime_lattice_analogy.svg
https://commons.wikimedia.org/wiki/File:Cassini-science-br.jpg
https://en.wikipedia.org/wiki/File:1e0657_scale.jpg