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Some of the things we talk about in this episode:

Dark Matter in the news: https://arstechnica.com/science/2018/03/galaxy-seems-to-lack-dark-matter-stumping-astronomers/

Nature Paper: https://www.nature.com/articles/nature25767

PDF of the paper: http://www.astro.yale.edu/dokkum/papers/mass.pdf

Galaxy Rotation Curve: https://en.wikipedia.org/wiki/Galaxy_rotation_curve

MACHOs, WIMPS & other weirdness: https://theconversation.com/from-machos-to-wimps-meet-the-top-five-candidates-for-dark-matter-51516

Dark matter and galaxy clusters: https://www.nasa.gov/feature/jpl/galaxy-clusters-reveal-new-dark-matter-insights

Galaxies in collision: https://phys.org/news/2016-10-galaxies-collide.html

The Bullet Cluster: https://apod.nasa.gov/apod/ap060824.html
https://en.wikipedia.org/wiki/Bullet_Cluster