Twenty years before his famous trial, Galileo Galilei had spent two years carefully considering how the results of his own telescopic observations of the heavens as well as his convictions about the truth of the Copernican theory could be aligned with the Catholic Church's position on biblical interpretation and the authority of the magisterium. The product of these two years was an unpublished letter to the Grand Duchess Christina of Tuscany, the mother of his patron, Cosimo II de' Medici. Much has changed since this letter was written in 1615, but much has remained the same. This collection...