Summary
Highlights
John Green introduces the Scientific Revolution as a period of undeniable progress that reshaped understanding of the universe and humanity. He notes that this era marked a significant shift in human expectation for healthier and more prosperous lives, a concept that was new in human history. The Scientific Revolution broke with religious teachings, particularly the geocentric view of the universe held by the Catholic Church.
The Catholic Church taught that the Earth was the center of the universe, with the sun, moon, and planets orbiting it perfectly. Copernicus, in his 1543 publication "On the Revolution of the Celestial Spheres," proposed a heliocentric (sun-centered) model. This idea was met with negative reactions from the Church, leading to persecution of its proponents like Giordano Bruno. Further observations by Tycho Brahe and Johannes Kepler, who discovered elliptical planetary orbits, continued to challenge the traditional view of a perfectly created, immutable universe.
Galileo Galilei's observations with his self-invented telescope brought matters to a head. He was the first to observe Jupiter's moons and understand the Milky Way, and found irregular spots on the sun, all contradicting Church doctrine. Despite his efforts to teach the clergy about the heliocentric universe, his findings were condemned as heretical. In 1632, his publication "Dialogue Concerning the Two Chief World Systems" led to his conviction for heresy by the Roman Inquisition, forcing him to recant. The Catholic Church finally acknowledged its error in 1992, recognizing Galileo as the father of modern science for his emphasis on experimentation and mathematical calculation.
Galileo and other scientists used experimentation and mathematical calculation to confirm or refute hypotheses, establishing the genuinely revolutionary scientific method. This approach spread to other fields; for example, William Harvey's dissections showed the heart as a "piece of Machinery." However, many scientists still believed in unseen forces like astrology and alchemy. Francis Bacon championed these new scientific values, advocating for observation, experiments, and reason over ancient theories. His method of inductive reasoning emphasized drawing conclusions from specific, reliable facts.
René Descartes contributed to the new science by focusing on the mind and the importance of individual reason and doubt. His famous declaration, "I think therefore I am," prioritized the power of thinking and questioning in discovering truth. Descartes developed deductive reasoning, which relies on the mind's rational power to generate specific truths from its own theories. This philosophical approach was central to the scientific method.
Isaac Newton synthesized new methodologies and his own findings into universal laws of motion. Despite also practicing alchemy, Newton quantified major constructs like mass, inertia, force, velocity, and acceleration, producing the law of gravitation. His work, encapsulated in "Principia Mathematica" (1687), presented the universe as a fantastic, regular machine governed by decipherable laws. This marked a significant step in understanding the universe through scientific principles rather than divine will.
Contact with the wider world introduced new species and knowledge to Europe, sparking further scientific investigations. Garcia da Orta, a Portuguese doctor, studied plants in India, advancing their use as medicine based on local knowledge. European advances often depended on gathering scientific and medical knowledge from other cultures, such as the use of quina-quina (quinine) for malaria. Within Europe, scientific networks like the Royal Society of London facilitated communication among scientists, spreading new ideas and discoveries. Governments also supported science by providing stipends and establishing academies, adding prestige to both scientists and royal courts.
The Scientific Revolution saw scientists bravely remove religious scriptures from the workings of astronomy and the heavens, replacing divine intervention with universal laws for the operation of the solar system and physical bodies. Although most people still believed in God, they embraced a developing scientific method and trusted their rational powers. This shift in thinking would prove immensely important, paving the way for future human achievements like landing on the Moon, just 350 years after Galileo first observed its cratered surface.