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Galileo was a great thinker of the Renaissance. For example, Galileo made many discoveries with the telescope. He discovered that the sun, not the earth was the center of the solar system.  With the telescope he also discovered that the moon had craters, mountains and valleys. Another thing he discovered with the telescope was discovering that the sun has sunspots that drifted from one side of the sun's disc to the other. Those are some ways how he made the telescope popular. Furthermore, he figured out that heavier objects fall faster than lighter objects. Many people also got surprised that heavier object fall faster than lighter objects. He figured this out by experimenting with objects of different sizes. Another accomplishment he made was making sketches and designs for a microscope but he did not invent the microscope.  Those are some reasons why he was a great thinker of the Renaissance.