Summary
Highlights
The publication of the 'Dialogue' was complicated by the Bubonic Plague, which devastated Florence and disrupted communication with Rome. While Galileo awaited approval from Roman censors, rumors reached Urban VIII that Galileo had portrayed the Pope's arguments through the character Simplicio, the 'simpleton,' a comedic fool. Feeling ridiculed, the Pope became enraged and convened a special commission, leading to Galileo being summoned before the Inquisition once again.
In 1633, Galileo, now 70 and in ill health, was put on trial by the Inquisition. The proceedings focused on whether he had violated the 1616 injunction against advocating Copernican theory. Realizing the gravity of his situation, Galileo, dressed in the robes of a penitent, recanted his views and swore to reject the 'false and contrary to scripture' doctrine. His book was banned for 200 years, and he was sentenced to house arrest.
Confined to his home in Arcetri, Galileo felt alienated and sad, signing letters from his 'prison.' Maria Celeste continued to support him, even taking on his penitential prayers. Her declining health during his absence and the stress of his trial led to her death at 33. Despite his grief and growing blindness, Galileo revisited his earlier work on the physics of motion, leading to 'Two New Sciences,' a book that laid the foundation for Isaac Newton's later work and revolutionized physics.
In a turbulent era of discord within the Christian World, Galileo Galilei rose to become Europe's most celebrated scientist. He was a brilliant writer and wit who created modern science through his early experiments in physics and observations of the universe. Despite being a faithful Catholic, his ambition led him to question the Church's view of the world and revolutionize astronomy. His daughter, Virginia, who became Sister Maria Celeste, supported him through his trials.
Galileo was born into a world where the common belief, based on Aristotle's teachings, was that the Sun moved around a static Earth. This geocentric view was supported by the Church, which also used astronomy for practical reasons like timekeeping. However, 60 years before Galileo, Nicholas Copernicus proposed a heliocentric system where the planets, including Earth, revolved around the Sun. This was initially met with ridicule for defying common sense observations of a stationary Earth.
Galileo developed the telescope, initially a Dutch toy, into a powerful scientific instrument. He improved its optics and used it for military applications for Venice, gaining a generous salary. However, his true passion lay in the stars. In 1609, he pointed his telescope at the moon, discovering its uneven, earth-like surface. He then observed Jupiter, finding four previously unseen moons orbiting it, directly challenging the geocentric model and publishing his findings in 'Sidereus Nuncius' (Starry Messenger).
Galileo became a vocal advocate for his new astronomy, but his fame was often accompanied by a reputation for arrogance. He moved to Florence to seek patronage from the powerful Medici family, naming Jupiter's moons after them. This move, however, placed him under the influence of a family with strong ties to the Vatican, a risk his friends warned him about. He also placed his illegitimate daughters, Virginia and Livia, in a convent.
Galileo, believing the Copernican system was correct, sought proof. He observed that Venus, if it revolved around the Sun, would exhibit phases like the moon. His telescopic observations confirmed this, strengthening his conviction. However, his outspoken defense of Copernicus, particularly in a letter to the Grand Duchess Christina, directly contradicted biblical passages like the one in the Book of Joshua. This led to accusations of heresy and the attention of the Inquisition.
Galileo traveled to Rome in 1616, confident he could persuade the Church hierarchy. However, the Holy Office of the Inquisition, led by Cardinal Bellarmine, declared the Copernican theory heretical. Galileo was ordered not to hold or defend the Copernican position, and Copernicus's book was added to the index of prohibited books. Galileo, understanding the severe penalties for heresy, reluctantly agreed, publicly retracting his views while privately expressing his frustration.
After Galileo's confrontation with the Church, his daughter Virginia took her vows and became Sister Maria Celeste, choosing her name in homage to his astronomical work. She remained a devoted and supportive daughter, writing numerous letters that reveal her concern for her father's well-being and his scientific pursuits. Despite his silencing, Galileo continued his observations, noting sunspots, which further challenged the Church's doctrine of perfect, unchanging heavenly bodies.
The election of a new Pope, Urban VIII (Maffeo Barberini), a former friend and admirer of Galileo, reignited Galileo's hopes. Their conversations led to the Pope granting Galileo permission to publish on Copernican theory, provided it was presented as a hypothesis. This prompted Galileo, at 60, to write his magnum opus, 'Dialogue Concerning the Two Chief World Systems.' Written in Italian, it presented a witty and persuasive case for the Copernican view through a dialogue between three characters.