In 1543, the Polish astronomer Nicolaus Copernicus lay on his deathbed, his just-published masterpiece On the Revolutions of the Heavenly Spheres in his hands. At that time, religious doctrine and common sense dictated that the earth ruled the universe, with the sun, moon, planets, and stars all rotating around it. By putting the sun at the center of that cosmology, his book fomented another kind of revolutiona scientific onethat would lead to a completely new view of the universe, and humanity's place in it. As contemporary cosmologists explore the universe's vastness and the nearly insignificant role we play in it, the repercussions from Copernicus's radical step continue to resound. With the energetic prose and powerful intelligence for which he is known, William T. Vollmann provides an enlightening and readable explication not only of Copernicus's book but also of Copernicus's epoch, and the momentous clash between the two.