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<p><b>New page</b></p><div>'''Galileo Galilei''' was an Italian astronomer, physicist, and mathematician who played a central role in the scientific revolution. He is known for his telescopic observations, for his defence of the heliocentric system, and for his formulation of the principles of motion. He was condemned by the Roman Inquisition, and he spent the last years of his life under house arrest.<br />
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== Early Life and Education ==<br />
Galileo was born in Pisa in 1564, the son of a musician. He studied medicine at the University of Pisa and later turned to mathematics, and he was appointed to a chair of mathematics in 1589.<br />
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He conducted experiments on falling bodies and on the pendulum, and he challenged the Aristotelian physics that was taught in the universities. His early work on motion laid the groundwork for the later development of mechanics.<br />
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He moved to the University of Padua in 1592, where he taught for eighteen years. Padua gave him freedom and a good salary, and he became known throughout Europe.<br />
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== The Telescope and Astronomy ==<br />
Galileo learned of the invention of the telescope in 1609 and built his own instruments with improved magnification. He turned them on the heavens and made a series of discoveries.<br />
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He observed the mountains of the moon, the moons of Jupiter, and the phases of Venus. The observations contradicted the Aristotelian cosmology and provided evidence for the Copernican system.<br />
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He published his findings in the Sidereal Messenger in 1610, and he was appointed mathematician and philosopher to the Grand Duke of Tuscany. His fame spread, and he was celebrated as the Columbus of the heavens.<br />
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== The Conflict with the Church ==<br />
Galileo's support for the Copernican system brought him into conflict with the Roman Catholic Church. In 1616 the Congregation of the Index declared the heliocentric doctrine to be contrary to Scripture, and Galileo was instructed not to defend it.<br />
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He returned to the question in 1632 with the Dialogue Concerning the Two Chief World Systems, which presented the arguments in favour of Copernicus. He was summoned to Rome and tried by the Inquisition.<br />
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He was forced to abjure, and he was sentenced to house arrest for the rest of his life. The episode became a symbol of the conflict between science and authority.<br />
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== The Two New Sciences ==<br />
During his house arrest Galileo wrote the Discourses and Mathematical Demonstrations Concerning Two New Sciences, published in 1638 in Leiden. The work treats the strength of materials and the science of motion.<br />
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He formulated the law of falling bodies, the principle of inertia in a limited form, and the analysis of projectile motion. The work is a foundation of classical mechanics.<br />
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He died at Arcetri, near Florence, in 1642, the year of the birth of Isaac Newton. His work was carried forward by his pupils and by the mathematicians of the following generation.<br />
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== Legacy ==<br />
Galileo is regarded as the founder of modern experimental science. His combination of observation, experiment, and mathematical analysis set a pattern for the investigation of nature.<br />
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His defence of the independence of scientific inquiry from religious authority has made him a symbol of intellectual freedom. He was rehabilitated by the Church in the twentieth century.<br />
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The conflict over heliocentrism is now understood as a complex episode in the history of both science and religion. Galileo's contributions to physics and astronomy remain fundamental.<br />
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== The Law of Falling Bodies ==<br />
Galileo established that bodies fall with the same acceleration regardless of their mass, in the absence of air resistance. The Aristotelian view, that heavier bodies fall faster, was thus refuted.<br />
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He used inclined planes to slow the motion and to measure it accurately, since he lacked precise timekeeping instruments. The experiments showed that the distance travelled is proportional to the square of the time.<br />
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He also formulated the principle that a body in motion continues in motion unless acted upon by a force. The principle was later incorporated into Newton's first law.<br />
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== The Conflict over Scripture ==<br />
Galileo argued that the Bible was not intended to teach astronomy and that the language of Scripture was accommodated to the understanding of ordinary people. He quoted a cardinal who had said that the intention of the Holy Spirit was to teach how to go to heaven, not how the heavens go.<br />
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His critics insisted on the literal reading of the passages that seem to describe the motion of the sun. The dispute became entangled with the politics of the papacy and with the rivalry between the religious orders.<br />
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He was defended by some theologians and attacked by others, and the controversy divided the Catholic world. The episode has been studied as a case of the relation between science and religion.<br />
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== The Trial and Its Aftermath ==<br />
Galileo was tried by the Inquisition in 1633 and was found to be vehemently suspected of heresy. He was required to abjure the heliocentric doctrine and was sentenced to imprisonment, which was commuted to house arrest.<br />
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He spent his last years at Arcetri, near Florence, where he continued to work. He was visited by scholars, including the poets and the scientists of the next generation.<br />
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The Dialogue was placed on the Index of Prohibited Books, where it remained until the nineteenth century. The condemnation was revoked by the Church in 1992, after a study by a papal commission.<br />
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== Influence on Science ==<br />
Galileo's approach combined mathematics with experiment and with observation. He insisted on the use of quantitative methods and on the rejection of authority as a basis for knowledge.<br />
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He designed a thermometer and a pendulum clock, though the clock was completed after his death. He also worked on the science of materials and on the strength of beams.<br />
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His disciples, including Torricelli and Viviani, carried on his work. The Accademia del Cimento in Florence was founded in the spirit of his experimental programme.<br />
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== Historical Assessment ==<br />
The debate over Galileo has been conducted by historians of science, of religion, and of culture. He has been portrayed both as a martyr for freedom of thought and as a difficult and ambitious man.<br />
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His scientific achievements are beyond dispute. He is regarded as a founder of modern physics and as a central figure of the scientific revolution.<br />
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His life illustrates the tensions between the new science and the institutions of his time. He remains a symbol of the pursuit of truth against authority.<br />
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== See also ==<br />
* Heliocentrism<br />
* Scientific revolution<br />
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== References ==<br />
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<ref name="r1">Drake, Stillman. Galileo at Work: His Scientific Biography. Chicago: University of Chicago Press, 1978.</ref><br />
<ref name="r2">Galilei, Galileo. Dialogue Concerning the Two Chief World Systems. Florence, 1632.</ref><br />
<ref name="r3">Fantoli, Annibale. Galileo: For Copernicanism and for the Church. Notre Dame: University of Notre Dame Press, 1996.</ref><br />
<ref name="r4">Reston, James. Galileo: A Life. New York: HarperCollins, 1994.</ref><br />
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[[Category:Physics]]<br />
[[Category:Astronomy]]<br />
[[Category:Italy]]</div>Huhu