Something dark and invisible makes up as much as 90 to 95 percent of the universe—and it took a little girl staring out a bedroom window at the night sky to bring it to light. 

As a child, Vera Rubin built her own telescope. As an adult, she uncovered a problem no telescope could solve: stars at the edges of galaxies were moving just as fast as those near the center. The math contradicted everything astronomers expected to see...unless the universe was filled with unseen matter.

This is the story of how Vera Rubin pushed through the gender barriers of the 1950s and turned a fringe idea into one of astronomy’s biggest open questions. What is dark matter? How did Rubin help prove it was real? And what does it mean that most of the universe is made of something we can’t see?

Guests: 

Ashley Yeager, Associate News Editor at Science News and Author of Bright Galaxies Dark Matter and Beyond: The Life of Astronomer Vera Rubin

Ramona Rubin, Granddaughter of Vera Rubin 

Deidre Hunter, Astronomer at the Lowell Observatory in Flagstaff, Arizona 

Amruta Jaodand, Astrophysicist at the Chandra X-Ray Center in the Smithsonian Astrophysical Observatory