Three presenters take on the universe's biggest questions, each working a different corner of the story. Adam Hart-Davis, Janet Sumner, and Maggie Aderin split the series between them, starting with the first microseconds after the Big Bang and working outward through stars, galaxies, and the physics that built them. The series covers the search for life beyond Earth and the prospects for future human settlement off-planet, treating both as open scientific questions rather than speculation. Aderin brings her astrophysics background to the more technical segments, while Hart-Davis handles the historical and conceptual groundwork, tracing how our picture of the cosmos changed as instruments improved. Sumner threads the newer research through, from exoplanet detection to the latest thinking on cosmic origins. The pitch is squarely introductory: no prior astronomy knowledge assumed, with each episode building on ideas from the last rather than assuming a specialist audience. It moves fast across a lot of ground, but keeps its footing by returning constantly to the same question: what do we actually know, and how do we know it?