As the title implies, cosmology has far to go, but Bartusiak's review of major discoveries and theories about the origin and characteristics of the universe also shows how far it has come. Especially great strides have been made recently as astrophysicists, who theorize on a multigalactic scale, and particle physicists, who study atoms and their components, converge upon a Grand Unified Theory from different directions. Having interviewed many of the U.S. scientists who are pushing back the frontiers of physics, Bartusiak identifies who has been responsible for what major developments. Her explanations of often bizarre-sounding theories are expressed metaphorically rather than in the mathematics or specialized terminology of physics. For general readers. Laurie Tynan, Huntingdon Cty. Lib., Pa.