page_title: Conflict thesis
section_title: Galileo affair
hierarchical_section_title: Conflict thesis / Modern views / Academic / Galileo affair
context_page_description: The conflict thesis is a historiographical approach in the history of science that originated in the 19th century which maintains that there is an intrinsic intellectual conflict between religion and science and that it inevitably leads to hostility. Most examples and interpretations of events in support of the thesis have been drawn from Western history. Historians of science have long ago rejected the thesis and have instead widely accepted a complexity thesis. Nonetheless, the thesis "remains strong elsewhere, not least in the popular mind."
context_section_description: The Galileo affair is an example commonly used by advocates of the conflict thesis. Maurice Finocchiaro writes that the Galileo affair epitomizes the common view of "the conflict between enlightened science and obscurantist religion," and that this view promotes "the myth that alleges the incompatibility between science and religion." Finocchiaro writes, "I believe that such a thesis is erroneous, misleading, and simplistic," and refers to John Draper, Andrew White, Voltaire, Einstein, Bertrand Russell, and Karl Popper as writers or icons who have promoted it. Finocchiaro also describes as mythical the notion that Galileo "saw" the Earth's motion, since this direct observation was only possible in the 21st century, and the idea that Galileo was "imprisoned", since he was "actually held under house arrest." He notes that the situation was complex and objections to the Copernican system included arguments that were philosophical and scientific, as well as theological.
  The Galileo affair was a sequence of events that begin around 1610, culminating with the trial and condemnation of Galileo Galilei by the Roman Catholic Inquisition in 1633 for his support of heliocentrism. In 1610, Galileo published his Sidereus Nuncius (Starry Messenger), describing the surprising observations that he had made with the new telescope, namely the phases of Venus and the Galilean moons of Jupiter. With these observations he promoted the heliocentric theory of Nicolaus Copernicus (published in De revolutionibus orbium coelestium in 1543). Galileo's initial discoveries were met with opposition within the Catholic Church, and in 1616, the Inquisition declared heliocentrism to be formally heretical. Heliocentric books were banned and Galileo was ordered to refrain from holding, teaching or defending heliocentric ideas.
  Pope Urban VIII had been an admirer and supporter of Galileo, and there is evidence he did not believe the Inquisition's declaration rendered heliocentrism a heresy. Urban may have rather viewed heliocentrism as a potentially dangerous or rash doctrine that nevertheless had utility in astronomical calculations. In 1632, Galileo published his  Dialogue Concerning the Two Chief World Systems, which implicitly defended heliocentrism, and was popular. Pope Urban VIII had asked that his own views on the matter be included in Galileo's book, and were voiced by a character named "Simplicio", who was a simpleton. This angered the Pope and weakened Galileo's position politically. Responding to mounting controversy over theology, astronomy and philosophy, the Roman Inquisition tried Galileo in 1633 and found him "vehemently suspect of heresy", sentencing him to indefinite imprisonment. Galileo's Dialogue was banned, the publication of his past or future works forbidden, he was ordered to "abjure, curse and detest" heliocentric ideas. Galileo was kept under house arrest until his death in 1642.
  Observations that favored the Copernican model over the Ptolemaic or other alternative models accumulated over time: the emergence of Newtonian mechanics later in the 17th century, the observation of the stellar aberration of light by James Bradley in the 18th century, the analysis of orbital motions of binary stars by William Herschel in the 19th century, and the accurate measurement of the stellar parallax in the 19th century.  According to physicist Christopher Graney, Galileo's own observations did not actually support the Copernican view, but were more consistent with Tycho Brahe's hybrid model where the Earth did not move, and everything else circled around it and the Sun. Copernicus' work De revolutionibus remained on the Index of banned books until 1758.
caption: Galileo before the Holy Office, a 19th-century painting by Joseph-Nicolas Robert-Fleury
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