The supernova of 1604 marks a major turning point in the cosmological crisis of the sixteenth and seventeenth centuries. Capturing the eyes and imagination of Europe, it ignited an explosion of ideas that forever changed the face of science. Variously interpreted as a comet or star, the new luminary brought together a broad network of scholars who debated the nature of the novelty and its origins in the universe. At the heart of the interdisciplinary discourse was Johannes Kepler, whose book On the New Star (1606) assessed the many disputes of the day. Beginning with several studies about...