Vera Rubin and Dark Matter

Vera Rubin first noticed the galaxy rotation problem, where the math that calculates the angular motion of galaxies does not match the observed path of those galaxies. After some modifications and alternatives to Newton's laws did not fit the evidence, she developed the theory of dark matter. This theory describes many astronomical observations and is widely accepted by the astronomical community.

Vera Rubin passed away on Dec 25, 2016 at age 88.