Before Vera Rubin discovered most of the universe, she was a girl who loved the night sky. She watched the Big Dipper circle the North Star. And when her eyelids grew heavy, she dreamed not about what she had seen, but about what she had not seen. She dreamed about the mysteries between the stars.As Vera grew older, she tried to uncover those mysteries. At her first conference, the male astronomers said her ideas were “outlandish.” They said they were “ridiculous.” Vera didn’t like their harsh words, pushing her away. So she started studying faraway galaxies no one else was interested in. The youngest wheeled like pinwheels. The oldest spun with their arms closed tight. And every single one showed that between the stars, there is stuff we cannot see. Scientists before Vera had suspected this “dark matter” made up most of the universe. But no one had been able to show it was there. No one, until Vera.The Stuff Between the Stars tells Vera’s incredible story, celebrates her brilliance, and shows how a girl’s never-ending love for the night sky changed the way we see our universe today.