Prepare to learn everything we still don’t know about our strange and mysterious universe! Humanity’s understanding of the physical world is full of gaps. Not tiny little gaps you can safely ignore - there are huge yawning voids in our basic notions of how the world works. PHD Comics creator Jorge Cham and particle physicist Daniel Whiteson have teamed up to explore everything we don't know about the universe: the enormous holes in our knowledge of the cosmos.   This fully illustrated introduction to the biggest mysteries in physics also helpfully demystifies many complicated things we do know about, from quarks and neutrinos to gravitational waves and exploding black holes. With equal doses of humour and delight, Cham and Whiteson invite us to see the universe as a possibly boundless expanse of uncharted territory that's still ours to explore.  “[A] lucid and irreverent survey of the many unsolved mysteries of our universe... Cham and Whiteson mesh comics, lighthearted infographics, and lively explanations to painlessly introduce curious readers to complex concepts in easily digestible chapters. This fun guide is just the ticket for science fans of any age.” - Publishers Weekly “Accessible and entertaining. . . . Cham and Whiteson distil the essence of the little we know—and the lots we have no idea about. . . . a very enjoyable read.” - Nature