Includes bibliographical references (pages 343-346) and index.

What is the universe made of? -- What is dark matter? -- What is dark energy? -- What is the most basic element of matter? -- The mysteries of mass -- Why is gravity so different from the other forces? -- What is space? -- What is time? -- How many dimensions are there? -- Can we travel faster than light? -- Who is shooting superfast particles at the earth? -- Why are we made of matter, not antimatter? -- What happened during the Big Bang? -- How BIG is the universe? -- Is there a theory of everything? -- Are we alone in the universe? -- A conclusion of sorts.

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. Jorge Cham and Daniel Whiteson team up to explore everything we don't know about the universe, and while introducing the biggest mysteries in physics, they also helpfully demystify many complicated things we do know. And although the universe is full of weird things that don't make any sense, Cham and Whiteson make a case that the questions we can't answer are as interesting as the ones we can, and they invite us to see the universe as a possibly boundless expanse of uncharted territory that's still ours to explore