Our universe would be composed of 80% of an unknown kind of matter... Really?

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Additional material on my blog :
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* The blogpost that goes with the video (in French):
https://sciencetonnante.wordpress.com...

* E. Verlinde's Entropic Gravity (in French): https://sciencetonnante.wordpress.com...

* Dark Matter AKA "The Cosmological Constant" (in French): https://sciencetonnante.wordpress.com...