Another cosmic problem, dark matter, was first spotted in the 1930s. Following Kuhn's template almost exactly, it was ignored for nearly forty years. Vera Rubin, an astronomer at Washington, D.C.'s Carnegie Institution, was the one to nail it down and make people deal with it. In the early 1970s, she showed that the shape, size, and spin of galaxies means either there is something wrong with gravity or there's much more matter out there in space than we can see.
