The Scientific Revolution

For many centuries in Europe, most scholars believed in the geocentric model of the universe — the idea that Earth was the center, and that the sun, moon, and planets moved around it. Ancient Greek thinkers like Aristotle and Ptolemy supported it, and it aligned with Church teachings that placed humanity at the center of God's creation.

In the early 1500s, a Polish astronomer named Nicolaus Copernicus proposed a different model. After years of calculations, he argued that the sun — not Earth — was at the center. This heliocentric model suggested Earth moved around the sun along with other planets.

The heliocentric model was controversial because it challenged both ancient authorities and Church teachings. Copernicus's work marked the beginning of a movement in which truth would increasingly be tested rather than simply accepted.

While Copernicus relied mostly on mathematical reasoning, later scientists began using new tools to gather physical evidence. The most important figure in this shift was Galileo Galilei. In 1609, Galileo improved the telescope and turned it toward the night sky.

Through his telescope, Galileo saw mountains and craters on the moon, spots on the sun, and four moons orbiting Jupiter. If moons orbited Jupiter, then Earth was not the center of all motion in the universe.

Galileo's work demonstrated a powerful new idea: truth could be discovered through observation and evidence, even if it contradicted authority. Evidence began to challenge established power.

As more thinkers questioned tradition, they began asking how knowledge should be discovered. Two philosophers shaped this discussion: Francis Bacon and René Descartes.

Bacon argued that knowledge should be based on careful observation and experimentation — an approach known as empiricism. He warned against relying on ancient texts or personal opinion. Descartes emphasized rationalism: the use of reason and logic. His famous statement, "I think, therefore I am," placed human reason at the center of knowledge.

This method shifted authority away from tradition and toward systematic investigation. Truth became something that could be tested and repeated.

By the late 1600s, the Scientific Revolution reached a major turning point with the work of Isaac Newton. In 1687, Newton published the Principia, explaining the laws of motion and universal gravitation.

Newton demonstrated that the same natural laws applied both on Earth and in space. An apple falling and the moon orbiting followed the same mathematical principles — the universe operated according to predictable rules.

The impact went beyond science. If the universe operated according to laws, some thinkers began to ask whether human society might also operate according to discoverable principles — a question that would shape future political and social thought.