Cosmos is a series that really gets me. From the pure scientific wonder to the top-shelf special effects, it's one of the things I look most forward to watching every week. I especially enjoy the focus on historical astronomers, and have been eagerly anticipating the inclusion of women in science. This Sunday, my wait is over. The series' eighth episode, "Sisters of the Sun," will bring us not one, but two brilliant women who changed the way we understand our universe. Judging by a preview clip (which we've got below), the episode will also touch on the obstacles faced by female scientists, particularly those working in the early 20th century.