Cecilia Payne-Gaposchkin was in her early 20s when she figured out what the stars are made of. Both she and her groundbreaking findings were ahead of their time. Continuing the legacy of women working at the Harvard College Observatory, Cecilia charted the way for a generation of female astronomers to come. This Best Of episode of Lost Women of Science follows Cecilia’s journey of discovery, journals her drive and determination against all odds, and takes you to the Harvard College Observatory itself to walk in Cecilia’s footsteps.