The Pursuit of the Unknown
The word conjecture derives from a root notion of throwing or casting things together, and over the centuries it has referred to prophecies as well as to reasoned judgments, tentative conclusions, whole-cloth inventions, and wild guesses. “Since I have mingled celestial physics with astronomy in this work, no one should be surprised at a certain amount of conjecture,” wrote Johannes Kepler in his Astronomia Nova of 1609. “This is the nature of physics, of medicine, and of all the sciences which make use of other axioms besides the most certain evidence of the eyes.” Here conjecture allows him