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Galileo Galilei Reading Comprehension Lesson

History of science reading comprehension passage and printable worksheet about Galileo Galilei — his discoveries, his telescope, his conflict with the Catholic Church, and his lasting legacy in science — for grades 5–9.

Reading Passage

Galileo Galilei

Galileo Galilei (1564–1642) was an Italian astronomer, physicist, and mathematician who played a central role in the Scientific Revolution — the great transformation in European thought that replaced medieval ideas about nature with the methods and discoveries of modern science. Born in Pisa, Italy, Galileo showed exceptional intellectual ability from an early age. He studied medicine at the University of Pisa before turning to mathematics and natural philosophy. He became a professor of mathematics and began a lifetime of observation, experimentation, and scientific writing that would change humanity’s understanding of the universe.

One of Galileo’s earliest important contributions was to the science of motion. Against the ancient Greek philosopher Aristotle’s claim that heavier objects fall faster than lighter ones, Galileo conducted experiments — reportedly dropping objects from the Leaning Tower of Pisa, though this story may be legendary — and concluded that all objects fall at the same rate regardless of their weight (ignoring air resistance). He also studied pendulums and developed early ideas about inertia — the tendency of objects in motion to stay in motion — that would later be refined by Isaac Newton. These insights into the laws of motion were fundamental to the development of modern physics.

In 1609, Galileo heard about a new Dutch invention — a telescope — and quickly built his own, improving on the original design. He was among the first to turn the telescope toward the night sky and record what he observed. His discoveries were astonishing: the Moon had mountains and craters rather than being a perfect smooth sphere as Aristotle had claimed. Jupiter had four moons orbiting it — now called the Galilean moons — proving that not all celestial bodies revolved around the Earth. The Milky Way was made up of countless individual stars. Venus showed phases like the Moon, consistent only with it orbiting the Sun, not the Earth.

These observations led Galileo to champion the heliocentric model of the solar system — the idea, first proposed by the Polish astronomer Nicolaus Copernicus in 1543, that the Earth and other planets orbit the Sun rather than the Sun orbiting the Earth. This view directly contradicted the Catholic Church’s official position, which held that Earth was the center of the universe. In 1616, Church authorities warned Galileo to stop advocating Copernican ideas. In 1632, Galileo published his Dialogue Concerning the Two Chief World Systems, which clearly supported heliocentrism. The Church condemned the book and summoned Galileo before the Inquisition.

In 1633, at the age of nearly 70, Galileo was tried by the Inquisition and forced to recant — to formally deny — his support for Copernican astronomy. Under the threat of torture, he publicly stated that the Earth did not move. According to a famous legend (probably not true), he whispered ‘And yet it moves’ after his recantation. He was sentenced to house arrest for the rest of his life. Despite this persecution, Galileo continued to write and conduct research until his eyesight failed completely. He died in 1642, the same year Isaac Newton was born. The Catholic Church officially acknowledged that Galileo was right in 1992 — 350 years after his death. Galileo is remembered as a founding father of modern science and a hero of intellectual courage.

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