Cosmologist Brian Keating delves into the captivating life and groundbreaking discoveries of famed astronomer Galileo Galilei. Keating highlights Galileo's innovative contributions to physics, including his observations of celestial bodies through his telescope and his formulation of the laws of motion. Keating also discusses Galileo's tumultuous relationship with the Catholic Church and the controversy surrounding his support for the heliocentric model of the universe. Overall, Keating portrays Galileo as a visionary scientist who challenged the established norms of his time and paved the way for modern scientific advancements.