The notion of the tiniest particle within an atom or the vastness of a supermassive galaxy is all but impossible for us to truly fathom; indeed, the realities of any phenomena at the extreme ends of the spectrum can be difficult to conceptualize, as they are so far beyond our experience. But while it can be challenging to imagine such magnitudes, say Kimberly Arcand and Megan Watzke, it is not insurmountable. In this fascinating tour, illustrated by former astrophysicist Katie Peek, they take us on an expansive journey to the limits of size, mass, distance, time, and temperature in our universe, relating them to things that our human brains can understand.