The cosmological revolution of the seventeenth century saw the establishment of physics and astronomy as autonomous spheres. The Ptolemaic universe was a hierarchy of dignity – sun and stars above, lowly earth at the bottom – supported by a hierarchy of disciplines that set theology and metaphysics at the apex of intellectual life. The advancing belief in heliocentrism that undid the first was paralleled by challenges to the second, starting with the humanist celebration of rhetoric and moral philosophy and carried further by Copernicus’s exaltation of astronomy, hitherto assigned the lowly place of a mere computational aid, as a source of truth. The authority of the Church was often restricted by political and cultural divisions, so that many heretical ideas could not be stamped out, and Galileo long found support from Jesuits and even the pope. As he lost it, he sought backing in a wider audience, publishing his writings in Italian rather than Latin, and in a popular style. Newton and his followers would similarly seek to substitute horizontal connections for the vertical ones around which intellectual life had long been organized, demonstrating elements of their theories to popular audiences and explicitly describing the kind of science they favored as “public.”