When we stare up at the night sky, we see shimmering stars, fuzzy galaxies and faint clouds of gas and dust. It is what we cannot see, however, that will forever remind us of astronomer Vera Rubin. Rubin is best known for confirming the existence of dark matter and, along the way, serving as an advocate for women in science and an inspiration to those who wanted to become scientists. She died on December 25, 2016. She was 88.