Did a sixteenth-century heretic grasp the nature of the cosmos?
Once he arrived and mounted the pyre, a crucifix was held up to his face. According to a witness, he turned away angrily. He could not speak; he had been gagged with a leather bridle. (Or, some say, an iron spike had been driven through his tongue.) He was tied to the stake, and the pyre was lit. When it had burned out, his remains were dumped into the Tiber. As Ingrid Rowland writes in “Giordano Bruno: Philosopher/Heretic” (Farrar, Straus & Giroux; $27), the Church thereby made Bruno a martyr. But “a martyr to what?” she asks. That is the question that her book, the first full-scale biography of Bruno in English, tries, with difficulty, to answer.
The New Yorker reviews a biography of Bruno, that wonderful heretic. On his three big ideas:
One was heliocentrism, the notion that the sun, not the Earth, was the center of the universe. This revision of the standard, Ptolemaic cosmos was, of course, not original to him. It had been made by the Polish astronomer Nicolaus Copernicus in 1543, five years before Bruno was born. But while Copernicus’s repositioning of the earth and the sun was a radical proposal—indeed, a heresy (the Church needed the Earth, the arena of salvation, to be the center of the universe)—in other respects his cosmos was quite orthodox: a finite structure consisting of fixed spheres that revolved in concentric circles, just as in Ptolemy. Bruno, on the other hand, proposed an infinite cosmos, consisting of innumerable heliocentric worlds. This, his second and most important idea, was also not new. It had been put forth by Nicholas of Cusa, a German cardinal, in the fifteenth century. But here, too, Bruno went further, claiming that the universe was a vast, wheeling, unknowable thing, and that all theories about it, including his own, were not descriptions but merely approaches—“models,” as we would call them today.
Finally, Bruno developed an atomic theory, whereby everything that existed was made up of identical particles—“seeds,” in his terminology. Other people, notably Lucretius, had had this idea, but, again, Bruno expanded it. Not only were all parts of the cosmos constituted of the same elements, but God, whom the Church strictly set apart from the material world, resided in these elements. It was his love, informing every “seed,” that unified the world.
