Astronomer Vera Rubin passed away Dec. 25, 2016, at the age of 88.

Vera Rubin. Photo by Carnegie Institution of Washington.

Rubin was a pioneer in her field — one of the few prominent women astronomers of her time, who, in an era of oppressive professional sexism, uncovered some of the best evidence of the existence of dark matter — the mysterious stuff that we can't see that binds the universe together.

Keep Reading Show less
Heroes