On December 25 the American astronomer Vera Rubin, whose discovery that galaxies were rotating too fast given the mass of their constituent stars provided evidence for the theory of dark matter, died at the age of 88. Her obituaries note the challenges Rubin faced as a pioneering woman in an overwhelmingly male field: prevented from doing graduate work at Princeton, she got her Ph.D. at Georgetown in 1954; in 1965 she became the first woman allowed access to the Palomar Observatory. In the June 2016 issue of Astronomy, Sarah Scoles decried the fact that Rubin’s discovery was somehow insufficient for a Nobel Prize, which she will now never win.

Inasmuch as Rubin was a pioneer, she was not the first woman in astronomy, nor the first to obtain a Ph.D., nor the first to be responsible for a discovery that fundamentally reshapes our understanding of the cosmos—nor the first for whom recognition was unfairly delayed. Some of the women who came before her are the subject of Dava Sobel’s new book, The Glass Universe, coincidentally out this month from Viking.