Physics Girl: How the Edge of Our Galaxy Defies Known Physics[VIDEO]

dark matter purposeful universe

Cosmologists believe that there is four times more dark matter than ordinary visible matter in our universe. But how do we know that dark matter exists? What is it anyway? Dark matter was originally hypothesized by Dr. Vera Rubin in the 1960s, and the hunt to find it continues today with the LHC (Large Hadron Collider), the most advanced scientific experiment on earth.

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